The correct answer is A . Project benefits should be maintained by taking corrective, and when required, preventive actions when deviations from planned benefits occur. Maintaining benefits requires active management, not passive observation. If expected benefits are not being achieved, are delayed, or are at risk, the organization should identify the cause of deviation and take action to restore or protect benefit realization. Corrective action addresses an existing deviation, while preventive action reduces the likelihood of future deviation. Option B, collecting performance measurements for each benefit, is important for monitoring, but measurement alone does not maintain benefits. Option C, reporting and communicating benefit status, supports visibility and decision-making, but communication alone does not correct underperformance. Maintaining benefits means acting on benefit information to preserve expected value. This may involve adjusting adoption plans, improving operational readiness, addressing stakeholder resistance, changing processes, providing training, or revising transition arrangements. The emphasis is on ensuring that project outcomes continue to support the desired benefits.

Reference topics: benefits management, corrective action, preventive action, planned benefits, benefit deviation, benefit realization control.