I believe the answer is B. choice of subject. Let me know if this helped.
I think it's d or b but I'm not so sure
<span>Answer
b. the textual clue that refers to the pronoun</span>
A pronoun antecedent refers to the word that comes before the pronoun.
The pronoun has to agree with the noun especially in number since it is the
part of speech that replaces the noun. In other words, when the pronoun is singular
then that means that the antecedent must also be singular however if the
pronoun is plural so do with the antecedent. In determining whether the
antecedent is singular or not, it is very important to know what words between
the antecedent and the pronoun to ignore.
chinese is spoken by her and her family
the car will be repaired by my dad tomorrow.
the animals were fed by the vet before their surgery.
the train is caught by sofia every single day before 10am.
many devices are bought by parents to educate their children.
a stray dog was found by me this evening.
a new computer will be bought by jane next month.
escher's work is admired by millions of people in the world.