When Documenting the Outcome of a Heat Therapy Treatment, Which

When documenting the outcome of a heat therapy treatment, which of the following best indicates that the intervention was effective and should be continued?

A) Patient reports the heat felt warm and comfortable.
B) Skin was red and moist after application of the heat.
C) Patient reported stiffness of joint was reduced immediately following heat application.
D) A 15-degree increase in hamstring length occurred following heat application.