Final answer:
Soldiers in Phase V or Phase V+ who do not meet the standards may be downgraded to Silver privileges, which is a part of the Initial Entry Training's structured system of rewards and responsibilities.
Step-by-step explanation:
Phase V and Phase V+ soldiers who fail to maintain the standards of their respective phase may be returned to either gold or Silver privileges. The correct answer is D) Silver. The Army's Initial Entry Training (IET) phases, including phases like Gold Phase and Silver Phase, involve a set of structured privileges and responsibilities that soldiers earn as they progress. If they fail to uphold the required standards, they can be reverted to a previous phase with fewer privileges as a corrective measure.