I am pretty sure that it is C.
I can describe..
A busy market has many people in it and buying groceries..
is this alright for you?
Plethora would be the collective noun because it is a group.
Answer:
It is important that students meet the deadlines for the delivery of their work on time, since this shows the commitment that the student has towards their academic performance and the will they have towards the classes. For this reason, making deliveries on time makes teachers take into account the student's personal effort when grading them, since they consider their academic integrity in addition to the content of their work.
On the other hand, it is beneficial for the student himself, since delivering his work on time means that if some corrections are necessary, they can be carried out with a reasonable time. In my case, I carry out this form of delivery to ensure that my conceptual rating is positive.
