Market power is defined as:

a. the ability of one or more firms profitably to maintain prices above competitive levels for a significant period of time
b. the ability of one or more firms to make a profit for a significant period of time c. the ability of one or more firms to evade taxes
d. the ability of one or more firms to join together in a co-op
e. the ability of one or more firms to consistently produce a superior product

a