B.
Transcription:
だって〝教授〟だよ
きっと何か意味があって
Vocabulary (new only):
- だって : 1. after all, as well, 2. but
- きっと : surely, most likely
- 何か : “something” (question word + か makes a “some” word; eg 誰か, someone; いくつか, some, several; どこか, somewhere, etc.
Interpretation
だって〝教授〟だよ => “But he is a Professor!”
きっと何か意味があって => “Surely there is some meaning…”
(and the sentence ends abruptly in a te-form because he is actually interrupted by someone replying to him, on next frame)