Answer:
supply curve for paper would shift to the left.
Explanation:
Negative externality is when the cost of either production or consumption activities to third parties not involved in the activities exceeds its benefit.
If the governmental makes the firm internalize the externality, the cost of production would increase.
If the cost of production increases, the firm would reduce supply in order to reduce costs.
A reduction in supply leads to a leftward shift of the supply curve.
I hope my answer helps you
