The correct option is C Mirage
A mirage is formed due to the refraction of light. The figure below illustrates the process of a mirage formation in a desert. On a hot sunny day, the air near the surface gets hotter and rarer than the air above. When light from a distant object travels towards the ground, it is actually going from a denser to rarer medium. So, it gets reflected back up if the angle of incidence is large enough, and we happen to see a mirage.