At Moderate Pressures (~ 200 Atm), the Measured Pressure Exerted

At moderate pressures (~ 200 atm) , the measured pressure exerted by CO₂ gas is less than that predicted by the ideal gas equation. This is mainly because

A) such high pressures cannot be accurately measured.
B) CO ₂ will condense to a liquid at 200 atm pressure.
C) gas phase collisions prevent CO ₂ molecules from colliding with the walls of the container.
D) of attractive intermolecular forces between CO ₂ molecules.
E) the volume occupied by the CO ₂ molecules themselves becomes significant.