The Gate Control Theory of Pain Argues That

The gate control theory of pain argues that:

A) a gate exists at the level of the spinal cord that integrates three sources of input.
B) a gate integrates the information from three types of input and then produces an output that determines the perception of pain.
C) the gate's output can be influenced by the physical extent of the injury, or by psychological factors such as anxiety or worry.
D) All of the above.