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

Multiple Choice

Scenario 18-3
Sam 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 $13 per hour. During the summer, he drives a tour bus around the ski resort, earning $11 per hour.
-Refer to Scenario 18-3. If Sam takes fewer hours of leisure in the summer than in the winter, we can assume that his labor supply curve for the range of earnings in this example

A) is horizontal.
B) is vertical.
C) is upward sloping.
D) has a backward-bending portion.