A person with a systolic blood pressure of $130 \mathrm{mmHg}$ and a diastolic pressure of $85 \mathrm{mmHg}$ would have a mean arterial pressure of about
a. $85 \mathrm{mmHg}$.
b. $100 \mathrm{mmHg}$.
c. $108 \mathrm{mmHg}$.
d. $115 \mathrm{mmHg}$.
e. $130 \mathrm{mmHg}$.