Answer:
(a) Assertive.
Step-by-step explanation:
An assertive sentence is a sentence that expresses an opinion, gives a statement, or expresses a feeling or incident or an event. Assertive sentences end with a period (.) and can either be a negative or positive sentence.
The given sentence "Pepperoni pizza is my favorite food" is assertive as it expresses the personal opinion or choice of the speaker.
Thus, the correct answer is option a.