The correct option is
A Unanimous
Option A - 'Anonymous' means made or done by someone whose name is not known or not made public. Thus option A is incorrect.
Option C - 'Obsolete' means not in use anymore, or having been replaced by something newer or better. Thus option C is incorrect.
Option D - 'Confession' is the act of admitting that you have done something wrong or illegal. Thus option D is incorrect.
Option B - 'Unanimous' means having a group of people agreeing about one matter completely. Thus option B is the correct answer.
'Fully in agreement - Unanimous'