Operational research must optimize revenue, minimize costs and select the best possible alternatives (using BPR for example).
Cost analysis (option A), benchmark (option C), examination of variations in number of products, don’t establish a relationship between innovation and gross margin.
In option B, the relationship is direct; directly established by the internal auditor.
The percentage of research to revenue may not reflect the effectiveness of research department because some companies are so hesitate to invest on research which may result the low %.
I think because it would be very hard for IA department to obtain sufficient information about competitors situation and their effectivness trends so I would say that B is the only right choice.
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