The most valid generalization for finding out what team-building activity all employees prefer would come from:
400 randomly chosen employees from the list of all employees.
This sample is the most representative of the entire employee population, as it includes employees from various departments, roles, and lengths of service, thereby allowing for a broader perspective on preferences.
The other options are more limited in scope:
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All employees who have worked in the company for 5 years or more would exclude newer employees and may not represent the preferences of the entire workforce.
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All 624 female employees in the company represents only one gender and may not reflect the preferences of male or non-binary employees.
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A group with one member from each department may not capture sufficient diversity within each department, especially if the departments vary significantly in size or culture.
Thus, the randomly chosen sample of 400 employees is likely to provide the most accurate generalization of preferences for team-building activities across the entire company.