Final answer:
The maximum SGLI coverage available to military personnel is $400,000, represented by answer choice D. However, the question about the number of students receiving $250 or more is unrelated to SGLI and cannot be determined from the information given.
Step-by-step explanation:
The maximum amount of Service Members Group Life Insurance (SGLI) coverage available to personnel is $400,000. Answer choice D accurately reflects this maximum coverage amount. SGLI is a life insurance program for military members which provides up to a $400,000 death benefit to designated beneficiaries. Enrollment in SGLI is automatic for most eligible service members, and they have the option to decline or elect lower coverage amounts in $50,000 increments. However, the question provided also mentions another statistic regarding a sample of students and the amount of $250 received, which seems to be unrelated to the SGLI information. Based on the SGLI context, the answer regarding the number of students who receive $250 or more cannot be determined, as there is no relevant relationship to SGLI coverage policies.