A solid aluminium ball, when quenched in a water bath maintained at 40°C, cools down from 550°C to 450°C in 20 seconds. The expected temperature of the ball after next 20 seconds may be about __________ °C. (A) 370
(B) 340
(C) 320
(D) 300
(B) 340
(C) 320
(D) 300