Answer:
1. The anxious college freshman: b. Complete subject.
2. freshman: d. Simple subject.
3. waited patiently to buy his books: c. Complete predicate.
4. waited: a. Simple predicate.
Step-by-step explanation:
The complete subject is the whole subject of a sentence including the modifiers. It also includes the simple subject that reveals who/ what is doing the action/ verb. while a simple subject just barely or only contains the "who/ what" of the sentence.
On the other hand, a simple predicate is the main verb that is done in the sentence while the complete predicate includes not only the main verb but also the whole extra words that follow the verb/ simple predicate.
Therefore, the different parts of the sentence are as follows-
The anxious college freshman (complete subject)
freshman (simple subject)
waited (simple predicate)
waited patiently to buy his books (complete predicate).