The following explains why the other choices are wrong:
A) The pronoun “who” is not appropriate in this context; instead, “whom” is the object of the verb “choose.”
B) The verb “had” is superfluous and grammatically incorrect, but the pronoun “whom” is used correctly. It ought to read “who had.”
C) In this situation, using “to whom” is awkward and unnecessary. The phrase “whom could they choose” is the proper form.
The following explains why the other choices are wrong:
A) The pronoun “who” is not appropriate in this context; instead, “whom” is the object of the verb “choose.”
B) The verb “had” is superfluous and grammatically incorrect, but the pronoun “whom” is used correctly. It ought to read “who had.”
C) In this situation, using “to whom” is awkward and unnecessary. The phrase “whom could they choose” is the proper form.