Correct option is B
In the context of arches, several terms describe the different parts and dimensions of the structure:
Spandrel: The spandrel is the space between the curve of the arch and the rectangular boundary (usually formed by the walls or supporting structure) above it. This area is typically filled with masonry.
Rise: The rise of an arch is the vertical distance between the springing line (the horizontal line at the base of the arch where it begins to curve) and the highest point of the inner curve of the arch, also known as the crown. The rise is a crucial dimension as it influences the shape and strength of the arch.
Intrados: The intrados is the inner curve or underside of the arch, which is visible from below.
Extrados: The extrados is the outer curve of the arch, which is the top surface or the external face of the arch.
Therefore, the rise is the vertical distance from the springing line (where the arch starts) to the crown (the highest point of the inner curve), making it the correct answer.
