According to Scenario 8.1, Fizzle and Sizzle

A) would be perfectly competitive if their purification costs were equal; otherwise, not.
B) would be perfectly competitive if it costs Fizzle $500,000 yearly to keep that land.
C) may or may not be perfect competitors, but their position on the river has nothing to do with it.
D) cannot be perfect competitors because they are not identical firms.

C