Answer: c. Arrange for the alliance to be managed at the corporate level.
Explanation:
To mitigate the risk of the various units of American Snacks partnering with Très Bien competitors, the alliance should be managed at Corporate level. All the different units are subservient at Corporate level therefore managing the alliance from there would mean that the different units cannot partner with rivals because Corporate level decisions are strategic and affect the entire company.
Partnering with rivals would therefore be unfeasible across the entire company.