In each set of sentences, choose the sentence that has a problem with pronoun-antecedent agreement. Students sometimes discover they don't like their chosen field.
A student sometimes discovers he or she doesn't like their chosen field.
Students may lose interest in their chosen field.

The sentence in this set of sentences that has a problem with the pronoun-antecedent agreement is:

A student sometimes discovers he or she doesn't like their chosen field.

Explanation:

The pronouns are "he or she" and "their."  These pronouns are preceded by the noun "student."  A better construction of the sentence is the first one, which says: "Students sometimes discover they don't like their chosen field."  The third sentence is also well-constructed.  They are simpler and less complicated than the second sentence.  Again, the first sentence has perfect agreement between the noun "students" and the pronouns "they" and "their."

from the count of monte cristo there are two synonyms of the word “grotto”. these words are chamber and cavern.