Two bulbs consume same energy when operated at `200 V and 300 V` , respectively . When these bulbs are connected in series across a dc source of `500 V`, then
A. Ratio of potential difference across them is 3/2
B. Ratio of potential difference across them is 9/4
C. Ratio of power consumed across them is 4/9
D. Ratio of power consumed across them is 2/3