A cold bottled drink (m = 2.5 kg, cp = 4200 J/kg•°C) at 5°C is left on a table in a room. The average temperature of the drink is observed to rise to 15°C in 30 minutes. The average rate of heat transfer to the drink is
(a) 23 W
(b) 29 W
(c) 58 W
(d) 88 W
(e) 122 W
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