Q: 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: On a hot day, an endotherm may give off more heat by increasing blood flow to the surface of the body.
 Question: After Sarah finishes her walk, she notices that her blood is not really pumping that hard. Sarah can know that since it's a cool day, she's giving off what kind of heat compared to usual? 
 Choices: A)more 
B)less
A:
less