B. In monsoon, there is chance of heavy rainfall. The hillsides are prone to landslide in heavy rainfall i.e. monsoon. So, it is never advisable to take shelter near hillsides during monsoon as your life will be at risk as well as you may face problems such as heavy traffic etc.
C. During an earthquake, the power supplies are cut off and you may get stuck in the elevator for long time. Also, if the intensity of earthquake is very high, there is chance of lift car falling to the bottom causing you severe damage, but this is very rare. So, it is advised not to use lifts at the time of earthquake.
D. Note: The question language is not comprehensible. It seems like the question is about giving reasons why the foundation of earthquake building is seperated from the ground
A seismic wave absorber layer is laid between the ground and the foundation of earthquake resistant building. This layer absorbs the pressure exerted by the earthquake tremors on the side walls of the building. Due to this, the building does not shake with the same intensity as the earth is shaking. Thus, the foundation of earthquake building is separated from the ground so that it can withstand the high pressure (load) exerted by the seismic waves on its sidewalls.