The underlined portion a predicate nominative include option C: For astronauts, going into space to repair orbiting equipment becomes "a challenge".
What is Predicate nominative?
A predicate nominative is considered as the grammar term because it has the equal weight and value like the subject. It always appears in a group of sentences.
The term "predicate nominative" is refers to as a noun clause, that are helpful for the predication of specified sentences.
The main difference between predicate nominative and predicate adjective is that predicate nominate is uses noun and predicate adjective uses a adjective for linking verb.
Therefore, correct option is C.
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