OPT:
a). alveoli.
b). toes.
c). the eyes.
d). arteries.
e). humans.
f). lungs.
g). hemoglobin.
h). veins.

Fact 1: Blood pressure is highest in arteries and lowest in veins. Fact 2: Blood is brought into the heart by veins and carried away by arteries. Given the two facts above, the highest blood pressure is found in ?
Answer:
d).