The correct option is D CPK
CPK stands fro creatinine phosphokinase, which is an enzyme found mainly in the heart, brain and skeletal muscle. When the total CPK levels is very high, it usually means there has been injury or stress to muscle tissue, the heart or the brain.
This test may be used to diagnose heart attack or evaluate cause of chest pain. Determining which specific from of CPK is high, helps in determining which tissue has been damaged.
Thus, the correct answer is option (C).