For their rulers, they had complex melodies. This indicates that the inhabitants of the Indus Valley had a robust system of central administration. Therefore, choice (D) is the adequate answer.
Urban planning, a scientific and political process dealing with how space is used and how the urban environment is created, is highly regarded in Indus cities. They are notable for their massive clusters of non-residential structures, huge water supply, and drainage systems, and baked brick residences.
In their area, there were no emperors, tombs, glory wars, or deadly conflicts. Surprisingly, the absence of all these contributes to the intrigue and originality of the Indus Valley culture.
Hence, option (D) is accurate.
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