Price Elasticity of Supply Requires Quantity Data Steps:

• Price elasticity of supply (PES) is (%ΔQS) / (%ΔP), where QS is quantity supplied and P is price.
• %ΔP = [(12 - 10) / 10] × 100% = 20%.
• No quantity supplied data is provided for initial or final QS.
• Without %ΔQS, PES cannot be calculated.

Why D is correct:

• D (2.0) would require %ΔQS = 40% (20% × 2.0), but this is arbitrary without data.

Why the others are wrong:

• A (0.5): Implies inelastic supply (%ΔQS = 10%), unsupported.
• B (0.75): Implies %ΔQS = 15%, unsupported.
• C (1.4): Implies %ΔQS = 28%, unsupported.

Not enough information. Final answer: Not enough information.