Pleases help will give braniests
Scenario:The year is 1202; the place is medieval England. You are John, king of England. Throughout the kingdom, all of the castle walls are crumbling to pieces and need to be rebuilt. You have been requested to decree a law that gives money to rebuild the walls. Before you approve the law, you have decided to conduct a cost-benefit analysis to decide what type of rocks should be used to rebuild the castle walls.

According to the scenario, what decision must you make?

A. what materials to use for the walls
B. whether or not to rebuild the walls
C. when to rebuild the walls
D. who should rebuild the walls