The answer is letter C.
<span> Muscles directly cause the movement of limbs in
the body. These are mostly made up of striated tissues that slide along each
other causing the movement of the whole body. These tissues are attached to the
bones that make up the skeletal system. They provide the structure and frame of
the body and they also serve as cushions and protection for the bones. Without
muscles movement will not be possible and we would seem like hollow structures
only made up of bones.</span>
