Answer:
The correct answer is option C.
Explanation:
A perfectly competitive firm faces a perfectly elastic demand curve. In a perfectly competitive market, there is a large number of buyers and sellers, such that no single firm is able to affects the price or output level. The demand curve faced by a single firm is a horizontal line.
The market demand curve, on the other hand, is downward sloping. So whatever be the market elasticity of demand, the elasticity of individual firm will be infinite.