Muscle fibers contract slowly and are highly resistant to fatigue.

The answer is Type1 muscle fibers. They are also referred to as slow-twitch fibers/ Red-Slow.  Different skeletal muscles have different skeletal muscle fibers with different properties depending on the role of the muscle. Endurance muscles are usually made of Type I skeletal muscle fibers while rapid movement muscles are mainly composed of Type II. Type I have a dense capillary network hence the low susceptibility to muscle fatigue.

C. a mature ovule of a plant.