In the First Law of Thermodynamics, the Sign of the Heat

In the first law of thermodynamics, the sign of the heat transfer Q:

A) is positive if the system gives energy as heat to the environment and negative if it absorbs energy as heat from the environment
B) is negative if the system gives energy as heat to the environment and positive if it absorbs energy as heat from the environment
C) is always positive
D) is always negative
E) depends on the sign of the work being done