Employees who are engaged with an external organization for the purpose of demanding better working...

Comprehensive and Detailed in Depth Explanation:

A labor union is an organized group of employees who join together to negotiate with their employer for better working conditions, wages, benefits, and other employment terms. Unions engage with external organizations (e.g., national union bodies) to represent employees’ interests and advocate on their behalf.

Option A (Labor union): Correct, as it describes employees organizing to demand better conditions.

Option B (Focus group): A focus group is a small group used for feedback or research, not for demanding conditions.

Option C (Joint venture): This is a business partnership between two organizations, not related to employee advocacy.