Concept:A change in supply is a shift of the whole supply curve caused by non‑price factors.
Explanation:A movement along the supply curve is caused only by a change in the price of the commodity itself.
A change in supply, however, occurs when other determinants change while the commodity price is held constant.
Such determinants include production cost, technology, weather, government policies, taxes, subsidies, and the number of sellers.
Therefore, the commodity's own price should be excluded from the factors that cause a change in supply.
The correct option must contain only the non‑price determinants of supply.
Answer:Option C: II, III, IV.