You are willing to pay full price for a new shirt, but you end up finding it half-off from an online retailer. Applying the cost-benefit principle, determine what has changed.

a. Your cost has decreased, but your benefit remains the same.
b. You receive a lesser benefit from the purchase because you got the shirt on sale.
c. You receive a greater benefit from the purchase because you got the shirt on sale.
d. Your cost and benefit have both decreased.