Maria goes on a shopping trip to get ready for her vacation. 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. Use the passage to answer the question.
If Maria 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