What are complete subjects

A complete subject is a simple subject, or the main word or words in a subject, along with any of the modifiers that might describe the subject.

To identify the complete subject in a sentence, ask yourself who or what performs the action in the sentence. When determining the complete subject, remember to include both the simple subject plus all of the words that modify it.

Explanation:

frederick the great, king of prussia was a general

c. landscape orientation