单选题 A description least likely to explain put-call parity is: A. A fiduciary call option strategy and a protective put option strategy for an underlying asset are equal in value. B. A put is equivalent to a long call, a long position in the underlying asset, and a long position in the risk-free asset. C. A call is equivalent to a long put, a long position in the underlying asset, and a short position in the risk-free asset.