Aaron, a healthcare worker, washed his hands, gave a patient a needle injection, and then disposed of the needle in a sharps container. Which best describes the error Aaron made in following standard precautions?

A. He should have placed the needle in the biohazards bin.
B. He should have put gloves on before working with the needle.
C. He should have contacted the CDC to report the use of a needle.
D. He should have checked the MSDS before disposing of the needle.