If Peter Is Allergic to Peanuts and Paul Is Not

If Peter is allergic to peanuts and Paul is not, what is the precise molecular difference in Peter's bloodstream responsible for this?

A) Peter's blood has mast cells and basophils carrying IgEs that match an antigen on peanuts.
B) Peter's blood has a continually excessive level of histamines and prostaglandins.
C) Paul's blood has mast cells and basophils with IgEs that confer immunotolerance to peanuts, but Peter's does not.
D) Peter inherited a peanut-specific IgG gene from his mother or father, while Paul did not.