Water is being boiled in flat bottom kettle placed on a stove. The area of the bottom is `3000cm^2` and the thickness is 2 mm. If the amount of steam produced is `1g//min`, calculate the difference of temperature between the inner and outer surface of the bottom. K for the material of kettle is 0.5`cal^@C//s//cm`, and the latent heat of steam is `540 cal//g`.

A. `0.12 xx 10^(-5)`K

B. `1.9 xx 10^(-3)`K

C. `1.3 xx 10^(-4^(@))`C

D. `1.2 xx 10^(-3)`K