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The answer to this question is A. when you do not have a sufficient amount of strong supporting evidence
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An appropriate time to modify your research plan is when you do not have a sufficient amount of strong supporting evidence.
What is a research?
Research is the methodical, thorough investigation of a certain issue, problem, or concern.
When a researcher cannot find adequate and convincing supporting data at a particular time, he or she may need to borrow more time to find the same to modify the research plan according to how much time will be needed to find perfect supporting evidences.
Hence, the correct option is A.
To learn more about research strategies here
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