A 10 kW drilling machineis used to drill a bore in a small aluminium block of mass 8 kg. How much is the rise in temperature of the block in 2.5 minutes, assuming 50% of power is used up in heating the block? (specific-heat of aluminum : 0.91 J/($$g^\circ C$$))

A

$$50^\circ C$$

B

$$206^\circ C$$

C

$$103^\circ C$$

D

$$227^\circ C$$