Answer:
The correct answer is letter "D": The senior should have aided the new auditor in formulating a plan for accumulating appropriate evidence.
Explanation:
For ethical and professional purposes, every time a piece of information is not clear several facts must be collected to complete the vague idea. In Auditing as in any other profession, the evidence must be gathered to confirm the company being audited is not committing fraud or forbidden practices.
Thus, in the example, the senior auditor should have helped the inexperienced editor in coming up with a plan to collect enough information about the budget difference. If that was not successful, they could have stopped the auditing until they received clarification of the situation.