The statement that would describe the shift from D1 to D2 is Demand for the product increased.
D2 is a curve that is to the right of D1 which means that it represents a higher level of demand for goods and services.
This means that for the demand to move from D1 to D2, there must have been an increase in the demand for the good or service and this could have been for any number of reasons including a reduction in the price of complimentary goods.
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