Explanation:

- When supply decreases with no change in demand, the equilibrium price is impacted.

- Option 1: No change in price

- This would typically occur only if both supply and demand shifted proportionally.

- Option 2: Price will fall

- A falling price usually happens when supply increases or demand decreases.

- Option 3: Price will rise

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- A decrease in supply with constant demand leads to higher competition among buyers, thus increasing the price.

- Option 4: None of these

- This option is incorrect as one of the previous options accurately describes the effect.

The correct scenario when supply decreases without a change in demand is that the equilibrium price will rise.