Which of the Following Best Describes Postural Hypotension

Which of the following best describes postural hypotension?

A) blood that has pooled in the veins while a patient is in the supine position resulting in dizziness when the patient attempts to stand
B) stiff lower back muscles
C) aching muscles from sitting in one place for too long a period of time
D) hormonal imbalance that causes dizziness upon lying down