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: When your brain senses that your body temperature is increasing, it sends messages to the blood vessels in the skin to increase in diameter.
 Question: Derek felt warm as he stood in the sun, and since his body was heating up, he knew that his blood vessels in his skin were 
 Choices: A)expanding 
B)contracting
A:
expanding