The answer choice which contains a sentence fragment is B. "Looked in his eyes and knew he was "the one.""
This refers to the type of sentence which does not have either the subject or main verb and are mainly a result of omissions.
Hence, we can see that from the answer choices, we can see that option B is the correct answer because there is a missing subject as we are not told who looked into his eyes, hence it is the one with a sentence fragment.
Read more about sentence fragment here:
https://brainly.com/question/582945