From the following, determine the value of closing stock using:

Feb 1 purchased 200 units @ ₦2.00 each
Feb 3 purchased 100 units @ ₦1.00 each
Feb 4 issued 120 units @ ₦5.00 each
Feb 5 purchased 50 units @ ₦3.00 each
Feb 6 issued 100 units @ ₦4.00 each

A. 330
B. 420
C. 230
D. 320

Correct Answer: Option C

C. 230