4) A group of students designs a model landfill. The purpose of the design is to keep as much liquid
as possible in the landi, which best describes a step the students should do as they
plan their model?
A) They should decide what kind of liquid to pour on the model.
B) They should compare their model with another group's.
C) They should decide how to collect the liquid that runs out of the model.
D) They should see how many landfills there are in the United States.