For whatever reason , Ennis had changed , and Jack was excited to be the recipient of his new feelings . Still , a small part of Jack remained guarded . Ennis 's history required a bit of self - preservation , and Jack could n't help that . It hurt , but it was necessary .

Q with options: Give answer the following question using evidence from the above passage: Why would a part of him remain guarded ?
Choose your answer from:
[I] He is afraid he will be rejected and will end up heartbroken .;
[II] He is guarded by a large dog , still .;
[III] None of the above choices .;
[IV] He is worried someone will steal his belongings .;
[I]