A scientist took a metal rod and a wooden rod and wrapped each of them in a piece of paper. These were then heated as shown. It was found that the paper around the metal rod does not burn whereas the one around the wooden rod catches fire. It is because
(A) Iron being a good conductor, conducts away heat given to paper
(B) Wood being an insulator, takes away all the heat
(C) Candle in case of iron rod, is near to the paper
(D) Paper, in first case, it thicker.