The Diamond-Water Paradox Is Illustrated by Which of the Following

The diamond-water paradox is illustrated by which of the following statements?

A) Water, a necessity, has a relatively low price whereas diamonds, usually a luxury, have a relatively high price.
B) Although water appears to have a relatively low price when compared to diamonds, in reality, it has a relatively higher price.
C) Although water appears to have a relatively low price when compared to diamonds, in reality, the prices are equal.
D) Although water appears to have a relatively low price when compared to diamonds, at the margin, water has the relatively higher price.
E) Although water appears to have a relatively low price when compared to diamonds, at the margin, the prices are equal.