Answer:
c. Pie
Explanation:
In order to determine which product is the most profitable, we must calculate the contribution margin per hour:
                       Cake        Pie            Cookies
contribution margin        $18         $11              $3
production time             3           1              .30
contribution margin p/hour   $6         $11             $10
Pie is the most profitable product, followed by cookies, and cakes are the less profitable products.