A beggar wrapped himself with a few layers of newspaper on a cold winter night. This helped him to keep himself warm because
(a) friction between the layers of newspaper produces heat.
(b) air trapped between the layers of newspaper is a bad conductor of heat.
(c) newspaper is a conductor of heat.
(d) newspaper is at a higher temperature than the temperature of the surrounding.
The heat from his body would not escape into surroundings this will help him to keep his body warm as the air trapped between the layers of newspaper is a bad conductor of heat.
Hence option (B) is correct.