While in Oakland, the girls hope to form a close bond with their mother and visit Disneyland; however, Cecile is hesitant to acknowledge their existence and sends them out daily to attend the People's Center, a day camp run by the Black Panther party.

1. in which sentence is the underlined portion a predicate nominative? for astronauts, going into space to repair orbiting equipment becomes a challenge. for astronauts, going into space to repair orbiting equipment becomes tricky. for astronauts, going into space to repair orbiting equipment becomes challenging. for astronauts, going into space to repair orbiting equipment becomes frequent.