A ___________ may be defined as an openable barrier secured in

a-may-be-defined-as-an-openable-barrier-secured-in

A ___________ may be defined as an openable barrier secured in an opening left in a wall for the purpose of providing access to the user of the structure.

A. Window

B. Door

C. Ventilator

D. Lintel

I had been asked this question during an online exam.

The origin of the question is Components of a Door in section Doors, Windows and Ventilators of Construction & Building Materials

The correct choice is B. Door

The best I can explain: Door basically consists of two parts, namely, frame and shutter. The door shutter is held in a position by the door frame which in turn is fixed in the opening of the wall by some suitable means.