Parallel
Perpendicular
Radial
None of these
Answer is Right!
Answer is Wrong!
The correct answer is: B. Perpendicular
Stratified stones are placed so that their planes are perpendicular to the direction of the arch’s thrust. This helps to distribute the load evenly and prevent the arch from collapsing.
Option A is incorrect because parallel planes would not provide enough support to the arch. Option C is incorrect because radial planes would not be able to withstand the weight of the arch. Option D is incorrect because there is no other option that is correct.