A point source S is placed at a height h from the bottom of a vessel of height `H(lt h)`. The vessel is polished at the base. Water is polished at the base. Water is gradually filled in the vessel at a constant rate `alpha m^(3)//s`. The distance d of image of the source after reflection from mirror from the bottom of the vessel varies with time t as
A.
B.
C.
D.
