Grapes Become More Expensive in the Market

Grapes become more expensive in the market. Which of the following can explain the increase in price?

A) Farmers are now able to produce larger grapevine yields using the same level of inputs.
B) The government reduces fuel taxes, which lowers transportation costs.
C) Grape production is the same, but wine production has gone up, which requires more grapes.
D) Consumers are purchasing fewer grapes as opposed to other types of fruits.