Choice "C" is correct. If demand is price inelastic, an increase in price will result in an increase in total revenue (positive relationship).
Choices "d" and "a" are incorrect, per the above statement.
Choice "b" is incorrect. When demand is price inelastic, an increase in price results in a decrease in quantity demanded that is proportionately smaller than the increase in price, thus having the result of an increase in total revenue (price multiplied by quantity).
