Which sentence uses two prepositional phrases?

the swarm of killer bees was reportedly migrating north.
the helicopter landed among the cars in the parking lot.
the case mystified the detectives through the long winter.
the camera monitoring the perimeter was hidden under the ivy.

themselves

an intensive pronoun is a pronoun that ends in self or selves, such as himself, herself, themselves, yourself, ourselves. since band members is a third person plural, the correct intensive pronoun would be themselves. if the band was talked about as a collective noun, itself would be the appropriate intensive pronoun. intensive pronouns are used to add emphasis to the noun it's modifying which is why it directly follows it.