Analyzing the key performance indicators is the correct answer. KPIs (key performance indicators) are the most reliable metrics to use. KPIs give you the progress rate, the remaining work to be done, the likely date of completion, and
the likely costs remaining. The other responses are incorrect because the Kanban board, backlog, and statuses will only give you small pieces of information, whereas KPIs provide a broader picture of the project at any given time.