A 100 W electric bulb was switched on in a $$2.5 m \times 3m \times 3 m$$ size thermally insulated room having temperature of $$20^\circ$$C. The room temperature at the end of 24 hrs. will be

A

$$100^\circ$$C

B

$$470^\circ$$C

C

$$370^\circ$$C

D

$$600^\circ$$C