Concept:A change in demand means a shift of the entire demand curve, caused by factors other than the commodity's own price.
Explanation:Change in demand is also called a shift in demand.
It occurs due to changes in taste, income, population size, income distribution, festivals, or prices of related goods.
A change in the price of the commodity itself causes a movement along the same demand curve, not a shift in demand.
Therefore, "price of the commodity" is not a cause of change in demand.
Answer:B. price of the commodity