The economies of the early civilizations of mohenjo-daro and harappa were based primarily on

growing cotton for export
collecting taxes
growing food
trade with china

The correct answer among the choices provided is the third option. The economies of the early civilizations of Mohenjo-daro and Harappa were based primarily on growing food. People from the Indus Valley eat healthy crops. Examples of these grown crops are melons, wheat, and peas.