In the First Law of Thermodynamics

Multiple Choice

In the first law of thermodynamics,
,W is positive when

A) the work is being done on the environment by the system.
B) the work is being done on the system by the environment.
C) the work is being done on the environment by the system,and the temperature of the system goes up.
D) the work is being done on the system by the environment,and the temperature of the system goes up.