The correct answer is A. My father, a huge baseball fan, taught me to throw when I was three.
Explanation
An appositive expression is a sentence that is composed of a noun or a noun phrase that is followed by another noun or pronoun and explains it in the complement of the sentence. For the above, it can be said that the correct answer is "A. My father, a huge baseball fan, taught me to throw when I was three" because it has the first noun "My father", the second noun "a huge baseball fan "and the complement where he explains it" taught me to throw when I was three"
