How is "residential history" relevant in personnel security?

Residential history is significant in personnel security primarily because it provides a record of an individual's previous addresses, which is crucial for conducting thorough background investigations. Investigators utilize this information to verify a person's identity, check for any criminal history, and assess the overall reliability of the individual. By documenting where a person has lived over time, authorities can uncover patterns that may indicate potential security risks, such as past associations with criminal activity or stability concerns.

The other options don’t directly relate to the primary focus of personnel security investigations. For instance, job location preferences are irrelevant to the assessment of an individual's trustworthiness or reliability. Educational history may offer insights into a person's qualifications but does not assess their personal background or potential risks. Similarly, a travel log does not inherently provide information that would aid in evaluating someone's suitability for a position concerning security concerns. Thus, B stands out as the most pertinent choice regarding how residential history impacts personnel security assessments.