Last Month,when 10,000 Units of a Product Were Manufactured,the Cost

Last month,when 10,000 units of a product were manufactured,the cost per unit was $60.At this level of activity,variable costs are 50% of total unit costs.If 10,500 units are manufactured next month and cost behaviour patterns remain unchanged the?

A) total variable cost will remain unchanged.
B) fixed costs will increase in total.
C) variable cost per unit will increase.
D) total cost per unit will decrease.