Answer: Created by investors and traded on various exchanges
Step-by-step explanation:
Call options are contracts that give the buyer the right to buy the underlying assets of the option on a particular date at a set price by exercising the option. American Call options can be exercised anytime before the date listed in the contract as well.
Call options are created by people who already own stock in the company i.e investors in IBM and traded on various exchanges such as the Chicago Board Options Exchange. It acts as a supplementary way to make income from stock if the investors do not believe that the stock price will go up thus enabling them to make income from the contract price.