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Ventilators are provided at the top of the room:

  1. A
    to bring oxygen for breathing.
  2. B
    so that sunlight may enter the room.
  3. C
    to maintain convectional currents to keep the air fresh in the room.
  4. D
    to provide an outlet for carbon dioxide.

Solution & Step-by-step Explanation

Warm air (which is exhaled and less dense) rises. Ventilators at the top of a room allow this warm, used air to escape, creating convectional currents that pull fresh, cooler air in from windows or doors lower down.

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Ventilators are provided at the top of the room:
A
to bring oxygen for breathing.
B
so that sunlight may enter the room.
C
to maintain convectional currents to keep the air fresh in the room.
D
to provide an outlet for carbon dioxide.

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