Question

Woolen clothes are better than cotton clothes in winter because
(1) Wool is good conductor of heat
(2) Wool has many tiny air spaces and can trap air better than cotton
(3) Cotton is good conductor of heat and cannot, therefore, act as an insulator
(4) Wool can supply heat to our body

Answer 1

option 2
it can trap air better than cotton ,air is a bad conductor of heat and hence does not allow heat to escape from our body ,thus keeping us warm..