Refer to the diagram above, which shows three supply curves for corn. A movement from point a to point b is caused by a change in the:

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A movement along a supply curve is caused by a change in the price of the product in the market. In this case, moving from point a to point b on any of the three supply curves would indicate a decrease in the price of corn in the market, leading to producers supplying less corn at that price. The other options (A, B, and D) would shift the entire supply curve, causing a different quantity supplied at any given price, but not causing a movement along the curve.

Refer to the Diagram Above, Which Shows Three Supply Curves