Answer:
b. greater in the beef market than in the milk market.
Explanation:
Elasticity of demand measures the responsiveness of quantity demanded to changes in price.
Demand is elastic if quantity demanded is more sensitive to changes in price. A small change in price leads to a greater change in quantity demanded.
Demand is inelastic if when price changes, there is little or no change in quantity demanded.
If there's bovine fever which decreases the population of beef cattle by 50 percent, supply would fall and price would rise. As a result of the rise in price, quantity demanded of beef would fall more than the quantity demanded of milk because beef has an elastic demand while milk has an inelastic demand.
I hope my answer helps you