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: At higher temperatures, particles of reactants have more energy, so they move faster.
 Question: When observing reactants and their particles, Shane increases the temperature they're exposed to, noting that they now move 
 Choices: A)faster 
B)slower
faster