为什么a不正确 forward commitment同时有权利和义务呀

问题如下：

In contrast to contingent claims, forward commitments provide the:

选项：

A.

right to buy or sell the underlying asset in the future.

B.

obligation to buy or sell the underlying asset in the future.

C.

promise to provide credit protection in the event of default.

解释：

B is correct. Forward commitments represent an obligation to buy or sell the underlying asset at an agreed upon price at a future date.

A is incorrect because the right to buy or sell the underlying asset is a characteristic of contingent claims, not forward commitments. C is incorrect because a credit default swap provides a promise to provide credit protection to the credit protection buyer in the event of a credit event such as a default or credit downgrade and is classified as a contingent claim.