Answer:
The correct answer is option a.
Explanation:
Price elasticity of demand measures the change in the quantity demanded of a commodity due to the change in its price.
The change in quantity demanded and price level affects the total revenue as the total revenue is the product of price and quantity demanded.
So when the price is elastic then a change in the price level will cause a greater change in quantity demanded and thus in revenue. Similarly, when demand is inelastic a change in the price level will cause a smaller change in quantity demanded and thus revenue.