Q. On a cold day when the room temperature is 15°C, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15°C, because:

• (A) plastics have a higher thermal conductivity than metals
• (B) plastics have a lower density than metals
• (C) metals are good conductors of heat
• (D) metals have higher thermal capacity than plastics