Answer:
c. Utilities expense is a mixed cost and rent expense is a fixed cost.
Explanation:
Seacrest Enterprises
                                         1000 units                       5000 Units
                   Total Cost     Total Cost /Unit     Total Cost       Total Cost/Unit
Direct materials  $5,000               $5.00        $25,000          $5.00
Utilities expense  $1,000                 $1.0 0        $3,750            $0.75
Rent expense        $4,000                    $4.00         $4,000            $0.80
Direct Materials show variable Costs
Utilities expense show mixed costs
Rent Expense show fixed costs
The correct answer is 
c. Utilities expense is a mixed cost and rent expense is a fixed cost.