He is in the habit of talking superfluously.

Answer: Option B

Continuously : without interruption or gaps.
Needlessly : in a way that is unnecessary because it is avoidable.
Fluently : with an ability to express oneself easily and articulately.
Authoritatively : in a way that is trusted as being accurate or true; with authority.
Superfluously : unnecessary, especially through being more than enough.

Synonym of Superfluously is Needlessly