she loads her cart with a bathing suit for $15.00, a sun hat for $8.00, magazines for $8.00, and a beach towel for $7.00. when she gets to the register, she realizes she only has $20.00 in her pocket. if maria decides to purchase the sun hat and towel, what is the opportunity cost of her purchase? select the two correct answers: a.) the sun hat, b.) the towel, c.) the magazines, or d.) the bathing suit
a.) the sun hat
b.) the towel