Suppose you sell a put option contract on December silver futures with a strike price of $18 per ounce. Each contract is for the delivery of 5,000 ounces. What happens if the December futures price is $20 per ounce? a. you make $10,000 payment and enter into a short position in the futures. b. the option will not be exercised. c. you make $10,000 payment and enter into a long position in the futures. d. you receive $10,000 payment and enter into a short position in the futures.