What are the minimum time requirements for a lance corporal to be eligible for promotion to corporal?

The correct choice reflects the established guidelines that set the minimum time requirements for promotion from lance corporal to corporal in the military. Specifically, a lance corporal must serve a minimum of 12 months in the current grade (time in grade) and also complete 12 months of total service (time in service) before being eligible for promotion. This requirement ensures that the individual has gained sufficient experience and maturity in their role, which is crucial for assuming the responsibilities of a higher rank.

This standard promotes readiness and ensures that candidates for promotion have demonstrated adequate performance and leadership capabilities over a significant period. While other options suggest various combinations of time that could be considered less than the required threshold, they fail to capture the full extent of experience necessary to safely and effectively fulfill the duties of a corporal.