The correct option is B what
The sentence needs a relative pronoun for 'she' in Blank 9. Option A cannot be used here as 'which' is not used for people. Options C cannot be used as 'whom' is an objective form of relative pronoun that can be used with noun or pronoun that is used as an object. Pronoun 'she' is always used as a subject, and not as object, in the sentence. The objective form of 'she' is 'her.' Option D cannot be used as 'whose' is a possessive form of relative pronoun that is used to show that the noun or pronoun is possessing or owning something or some quality. This is not the case in this sentence. So, only Option B can be used here as 'what' is used with people and things. Hence, Option B is the correct answer.