On cold days, if you touch an iron block and a wooden block in the morning, the iron block feels colder because

On cold days, when touching an iron block and a wooden block in the morning, the iron block feels colder because it has higher thermal conductivity than wood; option [B]. Thermal conductivity determines how efficiently a material conducts heat. Iron conducts heat away from the skin faster than wood does, resulting in a greater sensation of coldness. This occurs because iron can more effectively transfer heat from the skin to the surrounding environment, creating a perception of lower temperature. Wood, on the other hand, has lower thermal conductivity, so it conducts heat away from the skin more slowly, leading to a lesser sensation of coldness. Therefore, despite both blocks being at the same temperature, the iron block feels colder due to its ability to rapidly draw heat away from the skin, intensifying the perception of cold.