I think the correct answer is C. The pronoun was used as the predicate nominative of the sentence. The predicate nominative is a pronoun or a noun which is next to a verb and it describes or renames the subject. It usually follows a linking verb or a verb phrase. For this case, it is followed by the verb phrase "was".
D. when it tries to sell you products related to your obvious interests
The last one I believe is proofread
Answer: She was standing at the entrance in the car park
B and C because they are what you're talking about.