The correct answer is Rest, Ice, Compression, Elevation, Referral. This acronym, R.I.C.E.R, is commonly used in first aid treatment for acute injuries such as sprains, strains, or contusions. Resting the injured area helps prevent further damage, while applying ice reduces pain and inflammation. Compression with a bandage helps to control swelling, and elevating the injured area helps reduce swelling as well. Referral refers to seeking medical attention or professional advice for further assessment and treatment.