Identify the function of the labeled structures.
a:
b:
c:
d:

options-
-connects arteries and veins
-brings blood back to the heart
-carries blood away from the heart
-pushes blood into the arteries

A: last option

B: second option

C: third option

D: first option

the answer would be d

it also supports my hypothesis. if you rest first you can squeeze the clothespin more times. from the data i collected the average of the eight people concluded exercise makes your muscles more fatigued and less able to squeeze the clothespin compared to resting before squeezing.