Question

The dream of space travel became a reality2. how does the word reality function in the sentence?

Answer 1

Answer: D. as a predicate nominative.

     The sentence 'The dream of space travel became a reality' has the subject  'The dream of space travel', and a linking verb 'became', followed by 'a reality' that has the purpose of the adjective 'real'. It became real/ It is real= It is a reality. A predicate nominative or predicate noun renames the subject and completes a linking verb. A noun renames another noun.

Answer 2

Simplified without any modifiers, the sentence is Dream became reality. Reality satisfies the verb, making it a predicate nominative.