What age group is the most susceptible to sepsis?

Elderly patients are at most risk for developing sepsis because of decreased physiologic reserves and an aging immune system. Option A: Infants may have less physiologic reserves yet they have vaccines that strengthen their immune system than the elderly. Option B: Adolescents may not have fully mature reserves yet they have a stronger immune system than the elderly. Option D: Adolescents may not have fully mature reserves yet they have a stronger immune system than the elderly.