Where might a pronouns antecedent appear? a: after the noun in the sentence/b: all of the above /c: before the noun in the sentence /d: in an entirely different sentence

There is something called "Pronoun-antecedent-agreement" which basically explains the number and gender of the subject must be equal to the number and gender of its antecedent.

Example:

As you can see "My sister" is a female singular noun and "her" corresponds to this.

Now, the word antecedent indicates the rule for wich the pronoun stands, and as it says ante: before.

In the example "my sister" is the antecedent and "her" the pronoun.

d. because santiago thought any sharks would assume the marlin was part of the boat

when alex falls for the charming new boy at school, cole -- a handsome, funny, sports star who adores her - she can't believe she's finally found her soul who truly loves and understands her.  

at first, alex is blissfully happy. sure, cole seems a little jealous of her relationship with her close friend zack, but what guy would want his girlfriend spending all her time with another boy? as the months pass, though, alex can no longer ignore cole's small put-downs, pinches, or increasingly violent threats.  

as alex struggles to come to terms with the sweet boyfriend she fell in love with and the boyfriend whose "love" she no longer recognizes, she is forced to choose -- between her "true love" and herself.

explanation: