Read the passages carefully and answer the questions that follow:
Much later, in 1947, R.E.M. Wheeler, then Director-General of the ASI, tried to correlate this archaeological evidence with that of the Rigveda, the earliest known text in the subcontinent. He wrote:
The Rigveda mentions pur, meaning rampart, fort or stronghold. Indra, the Aryan war-god is called puramdara, the fort-destroyer. Where are - or were - these citadels? It has in the past been supposed that they were mythical ... The recent excavation of Harappa may be thought to have changed the picture. Here we have a highly evolved civilisation of essentially non-Aryan type, now known to have employed massive fortifications ...What destroyed this firmly settled civilisation? Climatic, economic or political deterioration may have weakened it, but its ultimate extinction is more likely to have been completed by deliberate and large-scale destruction. It may be no mere chance that at a late period of Mohenjodaro men, women, and children, appear to have been massacred there. On circumstantial evidence, Indra stands accused.
What do you conclude about the destruction of this civilization and why?

Explanation

Destruction of civilisation may have been due to the deterioration of climate, economic or political weakness. It ultimate extinction is more likely to have been completed by delibrate and large scale destruction.