Which sentence from paragraph 5 best supports the answer in part a? Underline the sentence

Write one paragraph that evaluates the effectiveness of jack zipes’s essay.

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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.