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: The more efficient a device is, the greater the percentage of usable energy it produces.
 Question: When a device become less efficient, its production of usable energy will go 
 Choices: A)up 
B)down
Output:
down