Ventilators are provided at the top of room:

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To bring oxygen for breathing

So that sunlight may enter the room

To maintain convection currents to keep the air fresh in the room

To provide an outlet for carbon dioxide

answer is C.

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Detailed Solution

Concept: Convection is the process of moving particles to transfer heat from one location to another. It occurs in a material that has the ability to flow, such as liquids and gasses. In solids, this is not conceivable.
The amount of inter-atomic vibrations between molecules or atoms of a substance is measured by temperature. High temperature causes a lot of inter-atomic motion and vibrations, which causes the density of the material to drop as the volume increases. At comparatively low temperatures, the opposite occurs. Inter-atomic vibrations are lower, and atoms or molecules are closer together, resulting in a higher density.
When we compare hot and cold air, we can see that cold air is denser than hot air. In a room with a mix of hot and cold air, the hot air rises because it is less dense, while the cold air sinks. This is accomplished through air convection. If there are human beings in the room, they will release body heat into the air, and if there is no source of cold air, the room will heat up. Ventilators are provided at the top to sustain convection currents and keep the air fresh and cold in the space.
Hence, the correct option is 3.

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