The window which opens outside a room of a building for admitting more light and air, is known as-

Correct option is A

A bay window is a type of window that projects outward from the main walls of a building, creating a small bay in the room. This type of window allows more light and air into the room compared to flat windows and also provides a wider view of the outside. Casement windows open on hinges, lantern windows are roof windows, and dormer windows are vertical windows set into a sloping roof.