When jane exercises, her duration relates to

a. how intense the exercise is
b. how aerobic the exercise is
c. what her resting heart rate is
d. how long the exercise lasts

Karen is waiting by the lockers before school for her friend richard. they had agreed to look over the history review sheet together to be ready for the test later that day. richard shows up late with uncombed hair and wrinkled clothes. karen: "you're five minutes late and you look like a wreck! " richard: (slams his locker) "you know, i don't have time for this." karen: "fine! figure out the test on your own! "