-Refer to the Graph Above to Answer This Question

Multiple Choice

-Refer to the graph above to answer this question.The graph shows a tennis coach charges $20 per hour for tennis lessons for adults and $10 per hour for tennis lessons for children.Suppose the coach provides lessons to the children only.What is the amount of the consumer surplus of the children taking the tennis lessons?

A) $20.
B) $50.
C) $120.
D) $160.
E) Cannot be determined.