Answer: A. A freeze kills half of the orange crop in Florida.
Explanation:
The most likely cause for a rise in the price of oranges is when a freeze kills half of the orange crop in Florida.
This will bring about the reduction in the supply of oranges since there'll be less orange crops. Hence, when this occurs there'll be greater demand and lesser supply of orange. This will ultimately lead to an increase in price since there is shortage of orange.
Therefore, the correct option is A