In which sentence is the underlined word or words a predicate adjective?

Samuel Morse’s telegraph line between Washington, D.C., and Baltimore was successful.

Samuel Morse was an artist and inventor.

A telegraph is an instrument that sends a message with electrical impulses.

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Samuel Morse's telegraph line between Washington, D.C. and Baltimore was successful.

The answer is A: Samuel Morse's telegraph...was successful.

 A predicate adjective modifies the subject of the sentence and comes after the noun they are modifying. The predicate adjective in a sentence is connected to the subject by a linking verb. In the example of the sentence A, sucessful is the predicate adjective, was is the linking verb and all that came before the verb is the subject.

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