Which type of pronoun is bolded in the following sentence?
if i had to choose one color, that would be my favorite.

There are two pronouns that are used in this sentence: I and my. The pronoun "I" is a subjective pronoun. It is used as the subject and the direct doer of the action in the sentence. The pronoun "my" is a possessive pronoun. Possessive pronouns always indicate ownership or possession. 

Dbecause it makes sense