Answer:
The arrow that represents the reflected ray is D.
Step-by-step explanation:
When a light ray travels from a less dense medium (air) to a denser medium (water), part of the ray is reflected at the boundary between the two media. The angle of reflection is equal to the angle of incidence, as measured from the perpendicular to the surface. In the diagram you provided, ray A is incident on the air-water boundary at an angle, and part of it is reflected back into the air as ray D, at the same angle as the angle of incidence. The remaining part of the ray refracts and continues into the water as ray C.