A) Professor Frank is faced with a conflict of interest
Conflict of interest can be define as making a decision that best work in one's own favour or one's own interest.
Based on the information given Professors Frank is faced with conflict on interest based on the requirements given to him.
If at the end of the day Professors Frank persuaded his student to purchase the game based on the $5,000 stipend that was offered to him, which means that Professor Frank has engaged in what is called Conflict of interest because of the financial Interest attached to the condition given to him.
Example of conflict of interest is providing your employer sensitive information to another company because of the financial gain attached to it.
Inconclusion A) Professor Frank is faced with a conflict of interest
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