The accounting equation for Ying Company shows a decrease in its assets and a decrease in its equity. Which of the following transactions could have caused that effect?

A. Equipment was purchased for cash.

B. The company paid an amount due on credit.

C. Cash was received from providing services to a customer.

D. Advertising expense for the month was paid in cash.

E. A utility bill was received for the current month, to be paid in the following month.