The moisture equilibrium chart can be used to determine the（）.

Absolute moisture content of the air surrounding a hygroscopic cargo when moisture equilibrium exists
B. Dew point temperature that the air surrounding a hygroscopic commodity will have when in moisture equilibrium with that commodity
C. Enthalpy of the air surrounding a hydroscopic cargo which is in moisture equilibrium with the cargo
D. Temperature at which moisture equilibrium will occur in a cargo hold containing a hygroscopic cargo