Answer:
c. Calvin's average variable cost is constant at $2.50
Step-by-step explanation:
Variable cost is the cost incurred on variable inputs, that varies directly with the quantity of good produced or service rendered.
Average Variable Cost is the variable cost per unit of output.
For Calvin as a transport provider, average cost per student for a picking dropping ride, is $2.50 (if the van is fully occupied)
So, as per given assumption that Calvin has a full man, his average variable cost is constant at $2.50