It depends on which word is underlined.
If the underlined word is <em>boat, </em>then it is used as A. predicate nominative in this sentence.
A predicate nominative is a noun following a copulative/linking verb.
The linking verb in this sentence is <em>is, </em>and the noun following it is <em>boat. </em>
Answer:
D
Explanation:
I don't know how to explain this.
I think it was well written because the concept seems interesting in itself that people could go back in time or into the future. Albert Einstein has a better theory though
