Which of the Following Has Not Been Proposed as a Motivation

Which of the following has not been proposed as a motivation for passing right-to-work laws?

A) to improve employment growth and other economic outcomes.
B) to protect individual freedoms by allowing workers to freely choose whether or not to become a union member.
C) to weak the labor movement and political support for conservative policies.
D) to ensure that union workers pay their fair share of the costs of union representation.