How Is Consolidation Among Fuel Providers Serving Airport Facilities Viewed

How is consolidation among fuel providers serving airport facilities viewed in the five forces model of competition?

A) as a reduction of the airlines' ability to benefit from economies of scale.
B) as an increase in switching costs because the airlines have no choice but to use jet fuel and other oil products.
C) as an increase in the bargaining power of suppliers of a critical input.
D) as an increase in the intensity of rivalry among airlines for scarce resources.