People Can Snorkel Down to a Depth of Roughly One

Multiple Choice

People can snorkel down to a depth of roughly one metre. This means that the additional pressure on the air in their lungs is roughly:

A) 9 800 N.
B) 9 800 Pa.
C) 9 800 ATM.
D) 19 600 N.
E) 19 600 N/m².