Skeletal Muscle Cells Consume Enormous Amounts of ATP

Short Answer

Skeletal muscle cells consume enormous amounts of ATP. From the following list, choose the two proteins that directly hydrolyze most of this ATP. Your answer would be a two-letter string composed of letters A to F only, in alphabetical order, e.g. AF.
A. Troponin complex
B. Ca²⁺-release channel
C. Myosin light chains
D. Myosin heavy chain
E. Myosin light-chain kinase
F. Sarcoplasmic reticulum Ca²⁺-pump