Lines 427-444: Explain how the evidence in this part of King's speech differs from the support for his first conclusion Give specific examples and explain if the evidence can be verified .

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.