Interstellar Space, Far from Any Stars, Is Filled with Hydrogen $\times$

Multiple Choice

Interstellar space, far from any stars, is filled with hydrogen atoms (1.0 atom/cm³) at 3.0 K. The pressure in the interstellar space is

A) 2.7 $\times$ 10^-23 N/m².
B) 4.1 $\times$ 10^-20 N/m².
C) 4.1 $\times$ 10^-23 N/m².
D) 6.2 $\times$ 10^-20 N/m².
E) 6.2 $\times$ 10^-23 N/m².