which of the statements are true regarding sentences components? A. the predicate can be a noun or a verb. B. Every sentence must have an object. C. the object can be a noun or a verb. D. Often the subject will act upon the object.

D. is correct because the subject acts upon the object (noun receiving the action) when the object is a direct object. When it's an indirect object, for example in the sentence "He gave Joe a present," Joe is the indirect object. But in most sentences the subject will act upon the object, so for example, "He punched Joe," Joe is the direct object in which the subject "he" acts upon.