Answer:
C. comes to class on time, participates in class discussions, and submits his assignments before the deadlines.
Step-by-step explanation:
Pararell structure is used to link the same word pattern in order to indicate that one idea is as important as another or some others as well. This can take place at any level, whether word, phrase or clause level. The most common way to link parallel structures is by using coordinators like "or" "and" and comma as well.
It is really important to note that verb tenses should not be mixed in any case. To make use of parallel structure, we must stick to the same verb conjugation in every example.