Concept:The proportion of a consumer's income spent on a commodity is a key determinant of its price elasticity of demand.
Explanation:Price elasticity of demand shows how strongly the quantity demanded responds to a change in price.
When a good takes up a large part of a consumer's income, a price rise causes a noticeable strain on the budget, so demand becomes more elastic.
When a good takes up only a very small part of income, consumers barely feel the price change, so demand tends to be inelastic.
Thus, the consumer's income level affects elasticity, as it determines how much of that income is spent on the commodity.
This makes option D the correct choice among the listed determinants.
Answer:D. Income of the consumers