A Cartel

A cartel:

A) is a group of buyers formally agreeing to buy product at a certain price.
B) is a group of firms formally agreeing to control their price and output that is legal in all countries.
C) is a group of firms formally agreeing to control their price and quality of their product, which is illegal in many countries.
D) is a group of firms formally agreeing to control their price and output levels, which is illegal in many countries.