Why Are Some Tissues Damaged by Diphtheria Toxin While Others

Why are some tissues damaged by diphtheria toxin while others are unaffected by it?

A) Diphtheria toxin is a superantigen. Only TH cells are affected by this type of toxin, so tissues lacking TH cells are unaffected.
B) The causative agent is inhaled into the lungs, so only lung tissue is affected by the toxin released by the organism.
C) Diphtheria toxin is an A-B toxin. Cells that do not have a receptor for the toxin are unaffected by it.
D) The causative agent is ingested, so only gastrointestinal tissue is affected by the toxin released by the organism.
E) Diphtheria is a localized infection. Only tissues in the immediate area of the bacteria are affected by the toxin.