Answer
B
Work Step by Step
The MHC denotes self, and should be the same in identical twins.
The other given options are all subject to variability through exposure and probability, whereas the MHC is consistent and hereditary.
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.