An Indifference Curve Cannot Be Positively Sloped Because

An indifference curve cannot be positively sloped because

A) the law of diminishing marginal utility would be violated.
B) the substitution effect would be violated.
C) a point to the right of another point will represent a lower quantity of both goods and a reduction in utility.
D) a point to the right of another point will represent a higher quantity of both goods and an increase in utility.