The Best Way to Estimate Height for a Patient with Both

The best way to estimate height for a patient with both legs amputated below the knee is to use

A) demi-span (distance from the sternal notch to the middle finger) .
B) knee height (with the use of calipers to measure heel-to-thigh distance) .
C) recumbent bed height measured while the patient is lying down.
D) the patient's stated pre-amputation height.