Scenario 18-3 Jerry Has Two Jobs,one for the Winter and One for One

Scenario 18-3
Jerry has two jobs,one for the winter and one for the summer.In the winter,he works as a lift attendant at a ski resort where he earns $10 per hour.During the summer,he drives a tour bus around the ski resort,earning $12 per hour.
-Refer to Scenario 18-3.During the summer months,what is Jerry's opportunity cost of taking an hour off work to go hiking?

A) $12
B) between $10 and $12
C) $10
D) less than $10