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By about 1700 B.C.E., the residents of Harappa and Mohenjo-daro began to abandon their cities because

Afrequent epidemics made city living impossible.
Bdeforestation of the Indus River valley brought about ecological degradation.
Cthe horse-riding Aryans began to invade the cities.
Dthe Indus River dried up.
EAll these answers are correct.

Verified Answer :

WorldlyGlass49

By about 1700 B.C.E., the residents of Harappa and Mohenjo-daro began to abandon their cities because deforestation of the Indus River valley brought about ecological degradation. 

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