Happy Heights Country Club Selected Accounts at July 31 Are

Happy Heights Country Club Selected accounts at July 31 are provided below:
$\begin{array}{|l|l|l|l|l|l|l|l|l|l|l|}\hline\text { CASH } & &\text { UNEARNE }\\& &\text { D TUITION }\\& &\text { REVENUE }\\\hline 7 / 1 \text { bal. } & 12,000 &&&&&&&&7 / 3 &1000\\\hline 7 / 3 & 1,000 \\\hline 7 / 5 & 3,600 \\\hline 7 / 7 & 1,800 \\\hline\\\hline\end{array}$ $\begin{array}{|l|l|l|l|l|l|l|l|l|l|}\hline\text { ACCOUNTS } & &\text { MEMBERS }\\\text { RECEIVABLE } & &\text { HIP }\\& &\text { REVENUE }\\\hline 7 / 2 & 3,600 &&7/7&1,800&&&&7 / 2 &3,600\\\hline & && & &&&&7 / 5 &3,600\\\hline \\\hline\end{array}$
-Refer to Happy Heights Country Club.Assuming that there are no other transactions,how much was owed to the country club by its members at the end of the month?

A) $3,600
B) $7,200
C) $1,800
D) $1,000