Suppose That Wilma's Utility Function Is Given by U(E)= 100

Multiple Choice

Suppose that Wilma's utility function is given by U(E) = 100 - 2E²,
Where E = Wilma's work effort in producing homemade dinners,measured in hours per day.The marginal utility of effort for Wilma is:

A) 2E².
B) -2E.
C) 100.
D) -4E.
E) none of the above.