Use the Following to Answer Questions

Multiple Choice

Use the following to answer questions :
Figure: Joanna's Time Allocation Budget Line
-(Figure: Joanna's Time Allocation Budget Line) The figure Joanna's Time Allocation Budget Line depicts what happens when she can choose how to spend 40 hours.If Joanna's wage increases and as a result she consumes LESS leisure,her supply curve of labour is:

A) horizontal.
B) upward-sloping.
C) downward-sloping.
D) vertical.