Final answer:
According to OSHA standards, employers must offer Hepatitis B vaccine to phlebotomists at no cost.
Step-by-step explanation:
According to OSHA (Occupational Safety and Health Administration) standards, employers must offer Hepatitis B vaccine to their phlebotomists at no cost.
This is because phlebotomists have a higher risk of exposure to bloodborne pathogens, including Hepatitis B. Hepatitis C, D, and E are not specifically mentioned in the OSHA standards regarding mandatory vaccines for phlebotomists.
Therefore, the correct answer is Hepatitis B (A).