What is 'were imprisoned' in the sentence 'Daedalus and his son Icarus were imprisoned in a great mazeComplete predicate C. Simple predicate B. Adverb phrase D. Verbal?

In the sentence "Daedalus and his son Icarus were imprisoned in a great maze," the phrase "were imprisoned" serves as the complete predicate. It includes the verb "were" (a form of "to be") and the past participle "imprisoned," indicating the state of being of the subjects. The simple predicate, which is the main verb or verb phrase without any modifiers, is "were imprisoned."