Why should a YouTube account be linked to a Google+ page?

Why should a YouTube account be linked to a Google+ page?

A) To get a “YouTube” tab on the Google+ profile and for auto-sharing of uploads to Google+ with customized posts.
B) So your video ads appear on Google+. too.
C) To get a “YouTube tab” on the Google+ profile.
D) For auto-sharing of uploads to …

Answer: B