A Consumer Maximizes Satisfaction at the Point Where His Subjective

Multiple Choice

A consumer maximizes satisfaction at the point where his subjective valuation of good X measured as the amount of good Y he or she is willing to give up to obtain an additional unit of X
Equals

A) one over the slope of the indifference curve through that point.
B) Py / Px.
C) Px/Py.
D) Y/Px.
E) the slope of the indifference curve through that point.