The correct answer is A. call option.
A call option is a contract that gives the buyer the right, but not the obligation, to buy a specified amount of an underlying asset at a specified price on or before a specified date. The seller of the call option is obligated to sell the asset at the specified price if the buyer exercises the option.
In the question, the buyer of the option has the right to buy 200 shares of stock at a specified price. This is a call option.
A stated option is an option that is not listed on an exchange. It is created between two parties, the buyer and the seller. The terms of the option are negotiated between the two parties.
An unstated option is an option that is not clearly defined. The terms of the option are not explicitly stated in the contract.
A contractual option is an option that is defined in a contract. The terms of the option are clearly stated in the contract.