Answer :
they is a subject pronoun and them is an object pronoun so in this sentence, them is correct.
Answer: them
Explanation: Both the noun phrase "the Bensons" and the pronoun that we have to choose make up this sentence's complement, in which nouns take the role of object ("The favorites for the show" being the subject and "were" being the verb), therefore, the object form of the pronoun (them) must be used.