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: Warming up exercises increases the blood flow to the muscles and increases the heart rate.
 Question: James spent 30 minutes exercising while Mary spent only 10 minutes exercising. Which person had the higher heart rate? 
 Choices: A)Mary 
B)James
A:
James