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