A new graduate nurse is working with an experienced nurse to chart assessment findings. The ...

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It is important that the nurse records only what is assessed without adding judgments or interpretations to the record.
Data do indeed change (and need to be charted) as the patient's condition changes, but this would not be the best answer to this question.
Assessment data may at times be difficult to obtain, but that would not occur often enough to warrant a warning about the difficulty in charting it. Also, obtaining data is a clearly different activity than charting it.
Charting can be time consuming and tedious, but this is not the most complete answer to this question.