Say a diastolic blood pressure reading was 80 mm Hg. This is consistent with which one of the following statements?

A: Because atmospheric pressure (about 760 mmHg) is always present, it is taken to be a “relative zero” and other pressures are stated as an amount greater than atmospheric pressure. We say 80 implying 80 more than 760, rather than stating 840 mmHg (760 + 80).