Answer:
The correct answer is a) firms are forced by competitive pressure to be as efficient as possible
Explanation:
In a perfect competition market, firms will have so much competition that they will be as efificient as possible. The definition of efficient here is determined by allocative efficiency and production efficienty.
Allocative efficiency means that in perfect competition firms will allocate resources where they work best to produce the most ouput, and production efficiency means that firms will supply exactly the amount of goods demanded by the public, making scarcity impossible.