Which of the Following Best Defines an Option

Which of the following best defines an option?

A) The lower bound of an option's value, or what the option would be worth if it were about to expire.
B) A contract that gives its owner the right to buy or sell some asset at a fixed price on or before a given date.
C) The value of a convertible bond if it could not be converted into common stock.
D) The right to sell an asset at a fixed price during a particular period of time. The opposite of a call option.
E) An option with payoffs in real goods.