Use the passage to answer the question
Maria goes on a shopping trip to get ready for her vacation. She loads her cart with a bathing suit for $15, a suntan hat for eight dollars, magazines for eight dollars, and a beach towel for seven dollars. When she gets to the register, she realizes her she only has $20 in her pocket.
If Maira decides to purchase the sun hat and towel, what is the opportunity cost of her purchase? Select all that apply.
a. the sun hat
b. the towel
c. the magazines
d. the bathing suit
c. the magazines
d. the bathing suit