Well the building could collapse because of the power of these seismic waves
d. Japan surrendered is the answer.
In 1945, two first atomic bombs were thrown to Hiroshima and Nagasaki by the United States, marking Japanese surrender.
Hope this helps~
The correct answer is B beacuase the meaning of Repose is trying to mean relaxation, plus you get to know they in the quote "power ceases" it means trying to be at peace or relaxing