Select the correct answer.
Read the paragraph, and then answer the question.

I woke up to the sound of someone moaning in pain. No matter where you go, you can’t escape the plague and death. There are more rats in our town than people these days. Many of my friends and family members have already become infected. Even my mother, who always carried a bouquet of carnations to ward away the miasma in the air. And our next-door neighbor, who underwent bleeding to remove the bad substances from her body that were causing the illness. Why is God punishing us, and when will it end?

Which sentence illustrates an actual cause of the plague?

A.
There are more rats in our town than people these days.
B.
Even my mother, who always carried a bouquet of carnations to ward away the miasma in the air.
C.
And our next-door neighbor who underwent bleeding to remove the bad substances from her body that were causing the illness.
D.
Why is God punishing us, and when will it end?