The inventory records for Radford Company reflected the following

Beginning inventory on May 1 700 units @ $3.00

First purchase on May 7 800 units @ $3.20

Second purchase on May 17 1,000 units @$3.30

Third purchase on May 23 600 units @$3.40

Sale on May 31 2,400 units @4.90

What is the amount of gross margin assuming FIFO cost flow method is used?

A. $3,860

B. $4,560

C. $4,130

D. $7,630