On May 1, Crane Company had beginning inventory consisting of 378 units with a unit cost of $9. During May, the company purchased inventory as follows:

756 units at $9

1134 units at $10

The company sold 1890 units durimng the month for $15 per unit. Crane uses the average-cost method. Assuming that a periodic inventory system is used, the cost of Crane's inventory at May 31 is

A, $3780

B. $21546

C. $3402

D. $3591