This option reflects the agile mindset of inspecting and adapting to the current situation, and finding the best way to deliver value to the customer. The other options are either too rigid (B and C) or too risky (D) for an agile project.
However, this is only a suggestion based on one source of reference. You may find other sources that support a different answer, or have a different interpretation of the question. Therefore, you should always check the validity and reliability of the information you find online, and compare it with your own knowledge and experience.
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References: 1: Oliver Lehmann 175 questions - PM PrepCast Forum 2: (PDF) 175 PMP Sample Questions | khurram shahzad - Academia.edu 3: PMBOK Guide 5th Edition : Agile Practice Guide