Question

thick filaments are made of the protein
actin.
titin.
myosin.
tropomyosin.
nebulin.

Explanation:

In muscle structure, thick filaments are primarily composed of myosin protein. Actin makes up thin filaments. Titin is a large - elastic protein, tropomyosin and nebulin are associated with thin filaments and their regulation.

Answer:

C. myosin