Pick up the constituent of good brick earth whose excess causes the raw bricks shrink and warp during drying and burning, from the following:

ANS:A - Alumina

Silica excess --- bricks become brittle and weak.

Alumina excess -- bricks become too hard when burnt and warp on drying and cause cracks.

Lime excess in the form of a lump of lime causes bricks to disintegrate hence bricks shape is lost.