What is atmospheric pressure?

Question

A. Pressure of the air inside the body

B. Pressure of the air outside the body

C. Pressure of the air within one’s mouth

D. Pressure of the air within one’s lungs

i think its D

Answer 1

Please think again.

http://kids.earth.nasa.gov/archive/air_pressure/index.html

Answer 2

Atmospheric pressure is the pressure of the air outside the body.

Its B.