The correct answer is A. Rest.
Explanation
The REST treatment for injuries is a set of four procedures to cure an injury in which each of its letters represents a procedure. The first is Rest, that is to say that the injured area should be left at rest for the first 48 following the injury; the second refers to Ice, that is, put ice on the wound for at least 20 minutes about 6 times per day; the third means Compression, that is to say that the area should be bandaged to prevent swelling, finally the fourth step refers to Elevation, that is, to keep the wound at least 8 inches elevated for recovery. So, the correct answer is A. Rest.