I hope this answer would be an answer you would be looking for as the question does not leave clear direction.
(de) = prefix
(Fen) = root/base
(dant) = suffix
This would all be broken down and explained on how this word would be pronouns and so on.
Part A : Binge-watching may improve relationships.
Part B: It is effective because the author provides several examples of how binge-watching increases social connections, and refers to outside sources.
You welcome.
It would be B.) had suggested. All past perfect forms begin with "had".