A Patient Has Been Walking in the Woods

A patient has been walking in the woods. He complains of severe pruritus. The nurse notes an erythematous area on his lower legs. The first nursing intervention for dermatitis venenata would be to

A) administer Benadryl, 50 mg IM.
B) wash area with copious amounts of water.
C) apply cool compresses continuously.
D) expose area to heat and air.