Myofilaments or myofibrils are
a)	Obliquely arranged filaments of muscle fibre	b)	Parallely arranged filaments of muscle fibre
c)	Horizontally arranged filaments of muscle fibre	d)	Radially arranged filaments of muscle fibre

(b)

Parallely arranged filament of muscle fibre.

Each muscle fibre is lined by the plasma membrane called sarcolemma enclosing the sarcoplasm. Muscle fibre is a syncitium as the sarcoplasm contains many nuclei. The endoplasmic reticulum, i.e., sarcoplasmic reticulum of the muscle fibres is the store house of calcium ions. A characteristic feature of muscle fibre is the presence of large number of parallely arranged filaments in the sarcoplasm called myofilaments or myofibrils