What Would Be the Account Balance in the Revenue Ledger

What would be the account balance in the revenue ledger account after the following transactions?
$\begin{array}{|l|l|}\hline \text { Performed services and left a bill } & \$ 4,200 \\\hline \text { Performed services and collected immediately } & \$ 3,500 \\\hline \text { Performed services and billed customer } & \$ 2,200 \\\hline \text { Performed services on account } & \$ 6,000 \\\hline \text { Received partial payment on account } & \$ 1,500\\\hline\end{array}$

A) $17,400
B) $10,900
C) $14,400
D) $ 9,000
E) $15,900