Contractile proteins au found in

(C) muscles
Contractile proteins are found in muscles, as they are associated with the movement of the body or organs. The contraction and relaxation of contractile proteins present in the muscles lead to the movement of organs, internal organs, etc.
Bones are the major supporting tissue that form the endoskeleton of a vertebrate body. Blood is a liquid connective tissue which is responsible for the transport of oxygen, nutrients, hormones etc. and for the production of antitoxins and antibodies etc. Cartilage provides support and flexibility to body parts and lubricates the surface of joints.