B - agenda
An agenda is what the author really wants to point out (their underlying message) and it's typically written in a way where it's somewhat hidden. Example: political ads - they have an agenda for what they want to talk about and why it's important.
This is active communication
Barrier communication because it blocks communication between people
Passive aggressive is being rude in a nice way because they don’t feel comfortable being rude.
Effective communication would be meant for business related communications to benefit from something.
Am I suppose to buy gifts for them