The number of gas molecules striking per second per square meter of the top surface of a table placed in a room at 20°C and 1 atmospheric pressure is of the order of (kB = 1.4 x 10–23 J/K, and the average mass of an air molecules is 5 x 10–27 kg)
(A) 1027
(B) 1023
(C) 1025
(D) 1029