Answer: C. Aqua will overcost Alpha's indirect costs as it is using a single cost pool to allocate indirect costs.
Explanation:
Aqua is using a single cost pool to allocate indirect costs which means that the indirect costs of both Alpha and Beta will be included in this cost pool.
This will overcost Alpha because Alpha only has minor portions of indirect costs while Beta has significant indirect costs. Putting both products together means that a lot of indirect costs assigned to Alpha will be from Beta which would mean that Alpha is overcosted.