Concept:A change in supply means the entire supply curve shifts, caused by factors other than the commodity's own price. A change in own price causes movement along the same curve.
Explanation:Options A, B, and C all shift the supply curve.
Technology, government policy, and entry of new firms affect producers' willingness and ability to supply at every price level.
The price of the commodity itself, option D, only causes a change in quantity supplied, not a change in supply.
When the own price rises or falls, you move along the existing supply curve, not shift it.
Therefore, the exception is option D.
Answer:D. Price of the commodity