A 400-G Stainless Steel Tea Kettle Containing 500 G of Water

A 400-g stainless steel tea kettle containing 500 g of water is on top of the stove. The portion of the tea kettle that is in contact with the heating element has an area of 0.090 m² and is 2.0 mm thick. At a certain moment, the temperature of the water is 75°C, and it is rising at the rate of 3C° per minute. What is the difference in temperature between the inside and the outside of the bottom of the tea kettle? The thermal conductivity of stainless steel is 16.3 W/(m·K) and the specific heat is 448 J/(kg·K) .

A) 2.2°C
B) 1.5°C
C) 1.1°C
D) 0.50°C
E) 0.015°C