One Important Difference Between Indifference Curves and Isoquants Is That

One important difference between indifference curves and isoquants is that:

A) indifference curves are convex while isoquants are concave to the origin.
B) indifference curves can never intersect while isoquants can intersect.
C) output shown on isoquants is measurable while well-being shown on indifference curves is not.
D) indifference curves are likely to be positively sloped while isoquants are mostly negatively sloped.