The Demand for Movies Is Unit Elastic If

The demand for movies is unit elastic if

A) a 5 per cent increase in the price leads to a 5 per cent decrease in the quantity demanded.
B) any increase in the price leads to a 1 per cent decrease in the quantity demanded.
C) a 5 per cent decrease in the price leads to an infinite increase in the quantity demanded.
D) a 5 per cent increase in the price leads to a 5 per cent increase in total revenue.