Final answer:
Performance evaluation is the method used to measure a Sailor's military bearing and adherence to core values.
Step-by-step explanation:
The method used to measure a Sailor's military bearing and adherence to core values is c) Performance evaluation. Performance evaluations are conducted in the military to assess an individual's conduct, attitude, and adherence to the organization's core values. This evaluation is typically carried out by senior officers or supervisors who observe and assess the Sailor's behavior, discipline, and professionalism.