Air Within the Funnel of a Large Tornado May Have

Multiple Choice

Air within the funnel of a large tornado may have a pressure of only 0.2 ATM. What is the approximate outward force on a (5 m * 10 m) wall if a tornado suddenly envelops the house? (1 ATM = 1.01*105 N/m².)

A) 4 * 103 N
B) 4 * 104 N
C) 4 * 105 N
D) 4 * 106 N
E) 7*105 N