Last year, Casey grew fresh vegetables, which she sold at her local farmers market, but this year, Casey did not plant any vegetables and went to work at a bank instead. Which of the following best explains Casey's career change?

A、Casey's opportunity costs of working at the bank exceeded Casey's benefits from gardening.;

B、Casey's opportunity costs of working at the bank exceeded Casey's opportunity costs of gardening.;

C、Casey's opportunity costs of gardening exceeded Casey's opportunity costs of working at the bank.;

D、Casey's opportunity costs of gardening exceeded Casey's benefits from working at the bank.