The correct option is B Euglenoids
Euglenoids are unicellular flagellate protists. They are without the cell wall. The body is covered by thin and flexible pellicle which is a protein-rich layer. The pellicle has oblique but parallel stripes called myonemes. The pellicle is composed of fibrous elastic protein, the small amount of lipid and carbohydrates and maintains a definite shape. It is flexible enough to permit temporary changes in the body shape.