The number one factor that determines elasticity of demand is D.The amount of people consuming the good or service
In economics, there exists demand when a large number of people that consume that product.
Hence, if a particular bar of soap is used by a large number of people when compared to the usage of another brand of soap, then there will be great demand for that particular product, which will in turn lead to an increase in price.
Therefore, the correct answer is option D.
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