The table presents three different weekly prices and quantities supplied for two products, X and Y. Which statement about price elasticity of supply (PES) is correct?
- AThe PES of X is elastic for a fall in its price from $15 to $10.
- BThe PES of X is unitary for a rise in its price from $15 to $20.
- CThe PES of Y is elastic for a fall in its price from $40 to $30.
- DThe PES of Y is unitary for a rise in its price from $40 to $50.