The correct answer is: B. 100 N/cm2
Mortar is a binding material used to lay bricks and other masonry units. It is made from a mixture of cement, sand, and water. The strength of mortar is important because it determines the strength of the masonry structure.
The minimum strength of mortar for load-bearing brick masonry is 100 N/cm2. This means that the mortar must be able to withstand a force of 100 Newtons per square centimeter before it fails.
Option A: 50 N/cm2 is not strong enough for load-bearing brick masonry.
Option C: 150 N/cm2 is strong enough for load-bearing brick masonry, but it is not the minimum strength required.
Option D: 200 N/cm2 is stronger than the minimum strength required for load-bearing brick masonry, but it is not necessary to use such strong mortar.