You need a barrel of oil next month. You could either buy the oil today and keep it for a month, wait and buy the oil next month when you need it, you could enter into a futures contract to buy oil at the current futures price $81, or you can pay $2 for a call option that gives you the right to buy oil for $80. The current spot price is $79 and the risk free rate is 2%, and carrying costs are $2. If the price ends up being $84 next month, then you should have ______________.
a) Waited to buy the oil
b) Entered into a futures contract
c) Bought a call option
d) Buy the oil today and store it for a month.