Your answer is Running through the hills. It has no subject.
Who is running through the hills?
answer is D.
Answer:
Dharahara was constructed for military usage as a watchtower. When incidents of national importance occurred, bugles were blown from the top floor of the tower. This was the signal for soldiers to assemble. This tradition of bugle trumpeting continued until the collapse of the tower.
C. Either
(Word cap filler)