In the market for grass-fed beef,what would cause a price increase?

A) The price of chicken decreases.
B) Doctors tell patients that beef is full of saturated fat that causes heart attacks.
C) The prices of grass and corn increase.
D) There is a movement in the United States toward vegetarianism.

Grass-fed beef requires grazing on grass or hay, which is more expensive than grain-fed beef that consumes corn. Therefore, an increase in the prices of grass and corn will inevitably raise the price of grass-fed beef. The other options would have no direct impact on the supply and demand of grass-fed beef.