Kate decided to spend $350 a new Ping driver to improve her golf game. She also considered Nike and TaylorMade drivers. The Nike was her second choice. The opportunity cost of Kate’s decision to buy the Ping was:
the price of the Ping driver, $350.
nothing since she got what wanted.
not being able to buy the Nike driver.
not being able to buy the TaylorMade driver.
not buying the Nike and the TaylorMade drivers.