It Is Advisable to Keep Well Away from an Old

Multiple Choice

It is advisable to keep well away from an old brick building during an earthquake.Why?

A) Old brick walls are generally not well anchored to the ground and often topple over.
B) The ornamental brick of the walls is not firmly attached to the main structure of the building, and it easily separates and falls.
C) The frequency of earthquake shaking matches the frequency of flexure of brick walls; they buckle in the middle and fall.
D) The mortar in old brick walls is generally crumbly, permitting groups of bricks to shake out and fall.
E) Overhanging brick parapets often break off and fall.