The Figure Given Below Shows the Demand Curve in the U.S

The figure given below shows the demand curve in the U.S. and the cost curves in U.S. and India.Figure: 16.4
In the figure:
MC: Marginal cost curve
ATC: Average total cost curve
D: Demand curve in the U.S.MR: Marginal revenue curve in the U.S.
-An increase in the income tax rates:

A) makes the labor supply curve more inelastic.
B) increases the opportunity cost of leisure.
C) lowers the opportunity cost of leisure.
D) shifts the labor supply curve to the right.
E) shifts the labor demand curve to the right.