Each Year, CTM Sells 450 Units of a Product at a Price

Each year, CTM sells 450 units of a product at a price of $639 each. The variable cost per unit is $421, the carrying cost per unit is $11.78, and the fixed order cost is $56. What is the economic order quantity?

A) 65 units
B) 58 units
C) 72 units
D) 53 units
E) 84 units