The exterior angle between outer faces of a wall, is known as A. Turn B. Junction C. Quion D. All the above

The correct answer is: A. Turn

A turn is an exterior angle between outer faces of a wall. It is formed by two adjacent walls meeting at a corner. The sum of the four exterior angles of a polygon is always 360 degrees.

A junction is a point where two or more things meet or join. In the context of walls, a junction is the point where two walls meet at a corner.

A quoin is a stone or brick used to form the external angle of a building. It is often decorative and can be made of different materials, such as stone, brick, or wood.

In conclusion, the correct answer is A. Turn.