choose the answer that correctly identifies the underlined word.
"the grain of the western prairies is a major source of income."
(1 point)
direct object indirect object predicate nominative predicate adjective

Based on the sentence given above, it seems that you have missed to identify which word is underlined so I will just try my best to help you with this. In the sentence, the subject is "The grain of the western prairies", "a major source of income" is used as a predicate nominative in this sentence because it is used to rename the subject. Hope this answers the question.