The lower half portion between crown and skew back of the arch, is called A. Spandril B. Haunch C. Springing D. Soffit

The correct answer is B. Haunch.

A haunch is the lower half portion between crown and skew back of the arch. It is the part of the arch that is in compression. The haunch is typically wider than the crown of the arch, which helps to distribute the weight of the arch evenly.

The other options are incorrect for the following reasons:

• Spandril: A spandril is the triangular space between the arch and the surrounding wall.
• Springing: The springing is the point where the arch meets the wall.
• Soffit: The soffit is the underside of an arch.