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: If the gas is heated, the particles will move faster as they gain more energy.
 Question: Tina heats some oxygen gas. The oxygen particles will move 
 Choices: A)faster 
B)slower
faster