The correct answer is: C. Relieving arch
A relieving arch is an arch that is built over a lintel or flat arch to support the weight of the wall above. It is typically used in areas where the lintel or flat arch is not strong enough to support the weight of the wall. Relieving arches are often used in doorways, windows, and other openings in walls.
A segmental arch is a type of arch that is less than a semicircle. It is often used in bridges and other structures where the arch needs to be strong but does not need to be very high.
A pointed arch is a type of arch that is shaped like a pointed triangle. It is often used in Gothic architecture.
A flat arch is a type of arch that is shaped like a straight line. It is the simplest type of arch and is often used in simple structures.