A candle of diameter `d` is floating on a liquid in a cylindrical container of diameter `D(D lt lt d)` as shown in figure. If is burning at the rate of `2 cm//h` then the top of the candle will :
A. remain at the same height
B. fall at the rate of `1 cm//hour`
C. fall at the rate of `2 cm//hour`
D. go up the rate of `1 cm//hour`
