Explanation:

- Increase in supply: This refers to a shift in the supply curve to the right. It's not necessarily related to a rise in price but to factors like technological improvements or reduced production costs.

- Decrease in supply: This happens when the supply curve shifts to the left, often due to factors like increased production costs or environmental restrictions, not due to price changes.

- Extension of supply: This occurs when there's a movement along the supply curve due to a rise in price. As the price goes up, the quantity supplied increases.

- None of these: This option would be selected if none of the above definitions matched, but here it’s unnecessary.