There's a Call Option Written for 100 Shares of GM

Multiple Choice

There's a call option written for 100 shares of GM stock for $85.00 a share, prior to the third Friday of October 2017: The option writer:

A) has the option but not the requirement of selling 100 shares of GM for $85.00.
B) will sell 100 shares of GM for $85.00 on the third Friday of October 2017.
C) has the option to back out of this contract prior to the third Friday of October 2017.
D) is required to post margin.