Explanation:

- Elasticity of supply is a measure of how much the quantity supplied responds to changes in price.

- On a straight line supply curve passing through the origin, the elasticity of supply is constant.

- The elasticity is calculated as the percentage change in quantity divided by the percentage change in price.

- When a supply curve passes through the origin, elasticity can be derived from the angle it makes with the quantity axis.

- On such a curve, the percentage change in quantity and price are proportional at any point.

- Option 1: 3.0

This would imply a very elastic supply, but not typical for origin-passing curves.

- Option 2: 1.0

When a supply curve passes through the origin, elasticity is typically unitary (1.0).

Correct Answer

- Option 3: 4.0

High elasticity, unlikely for this type of curve.

- Option 4: 2.0

Moderate elasticity, not consistent with curves passing through the origin.