A man has suffered a burn on the arm. There is a reddening of the skin but no other apparent damage. Using standard MEDICAL terminology，this is a（）.

A.major burn
B.secondary burn
C.second-degree burn
D.blister burn

A.can be absorbed through the skin
B.causes irreversible damage to eye tissue
C.is a very unstable product
D.All of the above

A.a small dose of alcohol
B.treatment for shock
C.a large meal
D.a brisk rub down