If you were to see a couple of inconsiderate people simply abandoning the remains of their picnic lunch on the lawn in front of the campus building in which your archaeology course is being held, you might ask them to pick up their:

Question

Quizplus · Accepted Answer

Primary refuse refers to the waste or discarded materials left at the location where they were used or produced, which in this case would be the remains of the picnic lunch left on the lawn.

If You Were to See a Couple of Inconsiderate People