Given the task definition and input, reply with output. 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: Lighter, more streamlined vehicles need less energy.
 Question: Jim is designing a new car and playing around with different materials. If he were to increase the weight of the vehicle, what would happen to the fuel efficiency of that vehicle? It would 
 Choices: A)increase 
B)decrease
decrease