Suppose We Are Given That the Value of a Particular

Multiple Choice

Suppose we are given that the value of a particular utility function is a constant.That is,U(X,Y) = c.Then,the total derivative of this relation is:

A) (U/X) dX + (U/Y) dY = c.
B) (U/X) dX + (U/Y) dY = 0.
C) (Y/X) dX + (X/Y) dY = 0.
D) (Y/X) dU + (X/Y) dU = c.