The Harappan civilization began to decline by :ABCE 900BBCE 600CBCE 1200DBCE 1700Answer: D. BCE 1700 Read Explanation: The fall of the Harappan civilizationThe Harappan civilization began to decline by BCE 1700. Several views prevail on the causes of its decline, like flood, external invasions, deforestation, decline of agricultural sector, epidemics etc. Read more in App