If the light moving in a straight-line bends by a small but fixed angle, it may be a case of

Light always travel in a straight-line path but if the light ray strikes to the reflecting surface, then it can bend back with the angle as it has incident on the surface. Then angle of reflection and angle of incident is same. This is called reflection. Also, when the light travels from one medium to another, its speed changes due to refractive index of the medium and hence it bends will the small angle. This is called refraction.

Hence option A and B are correct.