Why do people wear gloves on a winter day?A.Gloves are good heat conductors.B.Gloves allow convection warming.C.Gloves act as thermal insulators.D.Wearing gloves causes heat to flow into cold hands.

The correct answer is C. Gloves act as thermal insulators.

Here's why:

1. On a winter day, the temperature outside is usually much colder than the human body temperature.

2. When we expose our skin to the cold air, the heat from our body will naturally try to escape to warm up the cold, following the law of thermodynamics that heat flows from a warmer object to a cooler one. This is why our skin, especially extremities like hands, can quickly feel cold when exposed to winter air.

3. By wearing gloves, we add an extra layer of material between our skin and the cold air.

4. Most gloves are made from materials that are poor conductors of heat, such as wool, fur, or synthetic fibers. These materials trap the heat from our hands within the gloves instead of allowing it to escape into the cold air.

5. This is what is meant by gloves acting as "thermal insulators" - they insulate, or protect, our hands from the cold by keeping the heat in.

6. So, people wear gloves on a winter day to keep their hands warm by preventing heat loss.