The correct option is B voluntary
Skeletal muscles are attached to bones and occur in the form of bundles. Skeletal muscles are voluntary in thier action as the working of these muscles is under the conscious will of the organism.
Unlike skeletal muscles, cardiac muscles are involuntary as the functioning of these muscles is not under the conscious will of the organism.
Both skeletal and cardiac muscle fibres are striated in appearance. The striated appearance is due to the presence of dark bands and light bands.