Which of the Following Changes Describes the Collection of $7,000

Which of the following changes describes the collection of $7,000 from customers who had been charged on account for services performed during a previous accounting period?

A) Assets and shareholders' equity increase by $7,000.
B) Assets and liabilities increase by $7,000.
C) Assets and liabilities decrease by $7,000.
D) No changes in total assets, liabilities, or shareholders' equity.