Answer:
b. your demand for peanut butter increases today.
Step-by-step explanation:
Your demand for peanut butter increases today because you will expect two things to happen: 1) peanut butter will become more scarce in the future because of the drought 2) as a result of the increased scarcity, peanut butter will also be more expensive in the future.
Because of those two rational expectations, you will try to buy as much peanut butter as you can today, effectively increasing your demand for that good.