Which of the Following Is the Most Important to Prevent

Which of the following is the most important to prevent the spread of infection?

A) wearing a buttoned, clean cotton laboratory coat at all times in the laboratory
B) using antiseptic cleaner to wash the countertops after completion of work
C) double gloving when performing procedures that have a high likelihood of blood splashing
D) washing hands vigorously with germicidal soap and water when visible contamination exists, after removing gloves, and before leaving the laboratory