CTR Window Repair receives a shipment of glass from a vendor and issues payment for...

The correct answer is A. The facts indicate a possible nonconforming goods scheme, in which a vendor provides goods that fail to meet contract specifications while charging as though compliant goods were supplied. The most effective detection measure before customer complaints would have been an inspection of the glass upon receipt, including its packaging, appearance, description, and conformity with the contract. This control helps identify substitutions, inferior materials, counterfeit goods, or products of lower quality than promised. Option B is indirect and less reliable than inspecting the goods. Option C relates to change order abuse rather than quality substitution. Option D focuses on the vendor’s internal cost data and would not directly confirm whether the delivered glass met CTR’s contract specifications.