The correct option is A Deflection of the tail of the comet, away from sun.
As the comet approaches the sun while moving in an elliptical orbit, the dust particles from its surface start to lose contact with the surface, forming the tail of the comet.
Due to radiation pressure of solar radiations, the dust particles deflect away from the sun i.e. they move in the direction of incident solar radiation.
Hence, (A) is the correct answer.