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B
Actin, troponin
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C
Myosin, Troponin
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D
Actin, tropomyosin
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Solution
The correct option is C Actin, troponin, tropomyosin A. Actin, troponin, tropomyosin
Reason : Myofibrils are present in striated muscles and are also called muscle fibres. This myofibrils are composed of thick and thin filaments namely actin and myosin along with the troponin and tropomyosin muscle proteins. The co-ordination among these proteins help in muscle contraction and relaxation in a body.