The yield of corn in bushels per acre and the amount of rain in the growing season. Identify the explanatory variable and the response variable, if possible.

1. Amount of rain is the explanatory variable and yield of corn is the response variable.

2. Bushels per acre is the explanatory variable and amount of rain is the response variable.

3. Yield of corn is the explanatory variable and amount of rain is the response variable.

4. Amount of rain is the explanatory variable and bushels per acre is the response variable.

5. Rain is the explanatory variable and corn is the response variable.