“Some” marcadoras is it un, unas, unos, or una

The correct answer is:   [B]: " unas " .

        →   that is; " Unas marcadoras."
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Note: The question asks about the particular Spanish word—marcadoras—and which form of the indefinite article—

Note:  The term "indefinite article" refers to:

 ["some"] (plural) ; or,  ["a(n)"] (singular)} would be used.
     We are given the following answer choices:
     [A]:  ' un ' ;

     [B]:  ' unas ' ;

    [C]:  ' unos ' ;

     [D]:  ' una  ' .
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     Note that these answer choices constitute all the possible indefinite articles in the Spanish language.
     Note that in Spanish, the word: "marcadoras"—is a feminine, plural noun.  Furthermore, the Spanish word:  "marcadora"—is the feminine, single noun version.  This single feminine Spanish noun, along with the definite article, would be: la marcadora.
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Note that for Spanish—{Note: exception explained at end of this answer.}:

As a general rule:  {Note:  Exception explained at end of this answer.}:

                                                 Definite article             Indefinite article
                                                               ["the"]             ["a(n}"—singular]; or;

                                                                                       ["some"]—plural]:

Single noun, masculine:                           el                             un      

Single noun, feminine:                             la                            una      

Plural noun, masculine:                           los                          unos    
 {→ or:   [group of at least  
   one masculine;
   and one or more feminine] ;
→ take the plural noun, masculine:       los                          unos  
                      ⇒ i.e.    {"same as above"}.
__________________________________________________

Plural noun, feminine:                             las                          unos  

          Since the Spanish word:  "marcadoras" —is a plural, feminine noun, the indefinite form would be unas marcadas ;

 → which corresponds to Answer choice: [B]: " unas ".

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Note: This should not be confused with the Spanish word:
         →  el marcador ;  [single noun, masculine];  

       in which the plural form would be:
        → los marcadores ; and the indefinite pronouns for both the single noun form and plural noun forms, respectively,  would be "un" ; and "unos".
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Other note:  One expection in the Spanish language:
For Spanish words in that begin with the Spanish  a as the first syllable, the single, noun form, for the indefinite article is "el" , and the single noun, indefinite article is "un" —by convention—since otherwise the pronunciation would be difficult to comprehend}.
 Examples:  El agua as divertida.  La usamos para cocinar.  
    water—el agua (feminine);  
    Africa—el África (feminine):
    soul—el alama (feminine).
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Hope this is helpful to you;
Best wishes to you in your academic endeavors!

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