Which of the following encloses the remaining three?

In the context of muscle anatomy, the structure that encloses the remaining three structures given is muscle fascicle.

Muscle fibre (muscle cell) is a single muscle cell surrounded by a plasma membrane called the sarcolemma.

Muscle fascicle is a bundle of muscle fibers (cells) surrounded by a connective tissue sheath called the perimysium.

Myofibril is a cylindrical structure within a muscle fiber that contains the contractile units (sarcomeres) responsible for muscle contraction.

Myofilaments are the protein filaments within the sarcomeres, specifically actin and myosin, which are responsible for the actual muscle contraction.

Therefore, the muscle fascicle encloses the muscle fibers, myofibrils, and myofilaments within its structure.