Which of the following is a key factor in determining eligibility for access to classified information?

Reliability and trustworthiness are paramount in determining an individual's eligibility for access to classified information. When assessing someone for security clearance, agencies look for evidence that the individual can be counted on to handle sensitive information responsibly. This includes evaluating past behaviors, character references, and compliance with laws and regulations associated with national security. A person's history of decision-making, adherence to ethical standards, and overall reliability contribute to an assessment that this individual can be trusted with classified materials.

Other factors, while they may influence aspects of a person's life, such as public opinion or social media presence, do not directly measure one's ability to handle classified information. Similarly, employment history may provide context about a person's professional background, but it does not inherently reflect their trustworthiness or reliability. Therefore, the focus on reliability and trustworthiness directly aligns with the core purpose of security clearances, which is to protect national security by ensuring only qualified individuals can access sensitive information.