Paper slid in and out on a rolling tray meaning

Adam posted in a thread about theoretical physics. in his post he refuted general relativity and cited a paper that was recently self-published by one person on her own personal website and had no references to other works in the field. which important question did adam not answer sufficiently when evaluating the cited paper?

Hi brothers and sisters may you tell me the answer of question ?

Nos tuvimos que separar porque nos . a. recién casados b. llevabamos muy mal c. amistad