IgE-Mediated Reactions Seem Counterintuitive in Relation to Survival of the Fittest

IgE-mediated reactions seem counterintuitive in relation to survival of the fittest because it seems strange that a response that can cause life-threatening results would be preserved., However, IgE-mediated responses can be protective in responses to pathogens

A) by clearing the gastrointestinal tract via vomiting and diarrhea
B) by contracting or blocking airways
C) by increasing fluids and blood flow to allow better access to immune and inflammatory components to the site of an attack
D) all of the above