A viral gastroenteritis that is common among infants and children can be prevented by administering the:

Rationale: A. Hepatitis A vaccine prevents hepatitis A virus infection, which primarily affects the liver, not viral gastroenteritis caused by other pathogens. B. Hepatitis B vaccine prevents hepatitis B virus infection, also primarily hepatic, and does not protect against common viral gastroenteritis. C. Rotavirus vaccine is the most effective preventive measure against rotavirus infection, which is a leading cause of severe viral gastroenteritis in infants and young children worldwide. It reduces the incidence of hospitalization, severe diarrhea, and dehydration caused by rotavirus. D. Vaccine for enterotoxigenic E. coli (ETEC) is not routinely available for infants and children in most countries and is primarily targeted for travelers, not for general pediatric prevention.