The Atmospheric Pressure at the Surface of Titan, Saturn's Largest

The atmospheric pressure at the surface of Titan, Saturn's largest satellite, is 1 1/2 atmospheres (i.e., 1 1/2 times the air pressure at sea level on Earth) . How much mass is contained in the atmosphere above a square meter of Titan's surface compared to the mass above a square meter of Earth's surface?

A) two-thirds as much as on Earth, because Titan has a smaller diameter and therefore a stronger gravitational pull than does Earth
B) 0.92 times that on Earth, because Titan rotates faster than Earth, reducing the gravitational pull at the equator
C) 1 1/2 times that on Earth, because the atmospheric pressure is directly proportional to the mass of the atmosphere
D) 10 times that on Earth, because Titan has less mass and therefore less gravity than does Earth