Context: Troy is deciding whether to see the lemurs or the otters at the zoo. He wants to see lots of animals, but the zoo is closing soon.
Suppose Troy decides to see the otters. Which result would be a cost?
A. Troy will save some time. The otters are close by, but he would have had to walk to the the other side of the zoo to see the lemurs.
B. Troy will give up the chance to see the lemurs. He would have enjoyed seeing them more than the otters.
Select the correct answer from the given choices and respond with the letter of the chosen option.
Answer: B