The inventory records for Radford Company reflected the following

Beginning inventory on May 1 2,000 units @ $5.60

First purchase on May 7 2,100 units @ $5.80

Second purchase on May 17 2,300 units @ $5.90

Third purchase on May 23 1,900 units @ $6.00

Sales on May 31 6,300 units @ $7.50

What is the weighted average cost per unit for May?

A. $5.77

B. $5.83

C. $5.90

D. $7.50