A shipping department is reporting that a laser printer in the receiving area is becoming jammed because the printer attempts to pull several sheets of paper for each print. Which of the following may be the cause？（）

A.Humidity is causing the paper to stick together.
B.The paper is sticking to the corona wire and causing the jam.
C.A4 paper is being used and may not be supported by laser printers.
D.The fusion roller is dirty and pulling too many sheets of paper.