"Which is a sign of pests in an operation? A. Paper scraps found balled up in a drawer B. Small pinholes found in sink plumbing C. Oily substance dripping from a range hood D. Electrical smell underneath equipment"
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Answer

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Step 1
Let's solve this pest detection problem systematically:

Step 2
: Analyze the characteristics of pest signs

- Pests typically leave behind specific indicators of their presence - Different types of pests create different types of damage or evidence

Final Answer

Paper scraps found balled up in a drawer is the clearest sign of pest infestation, specifically indicating rodent activity.