How much is this necklace?（）A.It's very nice. B.It's a birthday present from my parents.

How much is this necklace?（）A.It's very nice. B.It's a birthday present from my parents. C.It costs fifty pounds. D.It's a bargain.

The question asks "How much is this necklace?" which specifically inquires about the price of the necklace. To answer correctly, we need to select the option that provides a monetary value.

Option C directly states the cost with "It costs fifty pounds," which is the appropriate response to a price question. The other options either describe the necklace (A), explain its origin (B), or express an opinion about its value (D) without providing a specific price.

Answer: C