Myofibrils are the building blocks or contractile unit of each muscle fiber. The tiniest functional unit of skeletal muscle, the sarcomere, is found in the myofibrils and is made up of protein filaments: actin (thin) and myosin (thick).
RNA polymerase can't bind on the promoter region, so no transcription takes place, consequently, no protein translation.
here is some help: these to photos should give you the answer to this chart hope it helps.
The answer is D, because it is a form of camouflage and an adaptation to the environment for self defense