You will be given a definition of a task first, then some input of the task.
You are given a short paragraph, a question and two choices to answer from. Choose the correct answer based on the paragraph and write the answer(not the key).

Paragraph: As humidity increases, the water potential gradient across the inside and outside the leaf become more equal, and so the rate of transpiration decreases.
 Question: Joe noticed that the humidity inside the greenhouse was getting very high, so he opened the roof to let cooler air inside. Thus, when the water potential gradient across the inside and outside of the leaf becomes equal, the rate of transpiration will 
 Choices: A)increase 
B)decrease.
Output:
decrease.