Free energy, fugacitv and activity co-efficient are all affected by change in the temperature. The ftigacity co-efficient of a gas at constant pressure ______with the increase of reduced temperature.

1. Free energy, fugacitv and activity co-efficient are all affected by change in the temperature. The ftigacity co-efficient of a gas at constant pressure ______with the increase of reduced temperature. 
A. remains constant
B.  increases
C. decreases
D. decreases logarithmically

Ans: B