I believe it's the last two. "makes the lungs able to fill more completely" and "helps the blood vessels dilate more easily" hope this helps, have an amazing day :)
The answer B makes the most sense.
Answer:
neck circles
Explanation:
tilting your head back could possibly demage your spine and vertebras
Answer:
don't go meet that guy. you really have no clue if he is what he seems like. IF you go then i am going to go with you because i am not going to let you go by your self. You need to know more about this person. Be smart and bring somthing to protect yourself.
Explanation: