A six-month American call option contract is an agreement where

	a.	One side has the obligation to buy an asset for the market price in six month's time.
	b.	One side has the right to buy an asset for a certain price after six month's time .
	c.	One side has the obligation to buy an asset for a certain price in six month's time.
	d.	One side has the right to buy an asset for a certain price at some time during the next six months