The internal audit team judgmentally selected 60 of the 600 employee timesheets that were processed...

Comprehensive and Detailed Explanation:

When auditors use judgmental (non-statistical) sampling, the results apply only to the items tested and cannot be extrapolated statistically to the entire population. In this case, auditors tested 60 timesheets and found 3 exceptions. The appropriate conclusion is simply that 5% of the selected sample was not properly approved (D). Statements about effectiveness percentages (A, B) would require statistical sampling. Option C is inappropriate because exceptions do not prove flawed design — they may reflect control execution lapses. Per IIA standards, conclusions must reflect evidence without overgeneralization. Thus, Option D is the most appropriate conclusion.