On June 1, Williams Book Company sold Best Bookstore $4,300 of books for cash. During the month, Best Bookstore returned books costing $500 to Williams for a cash refund. In the same month, Best sold the remaining books to their customers for a total of $5,100

As a result of these transactions, at the end of the month, Best Bookstore's accounting equation will show a net:

A. Increase of Equity of $1,300

B. Increase of Assets of $5,100

C. Increase of Equity of $1,800

D. Decrease of Assets of $3,800