The correct option is C Who
Option C is the correct answer as ‘who’ is the relative pronoun used for people. A relative pronoun is used to connect a clause or phrase to a noun or pronoun. Here, ‘who’ connects the noun ‘woman’ to the clause ‘taught me how to drive.’ Option A cannot be used as ‘which’ is used for thing. Options B cannot be used as ‘whose’ is the possessive form of ‘who’ and is used when some kind of possession is shown. As this sentence does not talk about people possessing or owning something, ‘whose’ cannot be used here. Option D cannot be used as ‘where’ is used for place.