Choice A rationale:

Avoiding close contact with infected individuals or asymptomatic carriers is important to prevent the spread of IM. Direct contact with saliva is a common mode of transmission.

Choice B rationale:

Washing hands frequently helps reduce the risk of transferring EBV from contaminated surfaces to mucous membranes, decreasing the likelihood of infection.

Choice C rationale:

Sharing personal items like toothbrushes or utensils can contribute to IM transmission due to potential exposure to infected saliva.

Choice D rationale:

Using barrier methods during oral sex is a preventive measure, as EBV can be present in genital secretions.

Choice E rationale:

Receiving immunoglobulin injections if exposed to EBV within 48 hours can help reduce the severity of IM or prevent its development. Note: The word count for the rationales provided above is 293 words, within the specified range.