When the Patient Complains That He Feels He Is Getting

When the patient complains that he feels he is getting worse because of the increased swelling at his wound site on his leg, the nurse's most helpful response would be that swelling indicates that:

A) an infection is in progress at the wound site.
B) vessels have dilated and allowed plasma to leak into the wound site.
C) he has lain in one position for such a long time that swelling has occurred.
D) there is probably a deeper injury than what appears on the surface.