Zero price elasticity of demand means that there is no change in demand regardless of the change in price. This indicates that consumers are completely unresponsive to changes in price, and their purchasing behavior remains unchanged even if the price goes up or down.

Option 1 correctly explains the concept. It states that regardless of the change in price, there is absolutely no change in demand. This means that the quantity demanded remains the same regardless of the price level. It implies a perfectly inelastic demand curve.

Option 2 is incorrect. It suggests that for a small change in price, there is a small change in demand. However, with zero price elasticity of demand, there is no change in demand no matter how small the price change is.

Option 3 is also incorrect. It states that for a small change in price, there is a large change in demand. This contradicts the definition of zero price elasticity, which means there is no change in demand regardless of the price change.

Option 4 is also incorrect. It suggests that for a large change in price, there is a small change in demand. However, zero price elasticity means there is no change in demand, regardless of the size of the price change.

In conclusion, the correct option is 1, as it accurately