The quantity demanded of a commodity is influenced only by changes

The quantity demanded of a commodity is influenced by several factors, including tastes, weather, price of the commodity, and price of other commodities. However, this question suggests that the quantity demanded is only influenced by one factor, and asks to identify that factor. Out of the options provided, the correct answer is "price of the commodity," as it is one of the primary determinants of the quantity demanded. As the price of a commodity decreases, the quantity demanded generally increases, and vice versa. Other factors, such as tastes, weather, and prices of other commodities, can also affect the quantity demanded, but the price of the commodity is the most direct and significant influence.