In human relations, the irritation threshold is the

Aaction that causes an annoyance.
Bpoint at which a person notices something and becomes annoyed.
Clength of time an annoying behavior continues.
Dfrequency of the annoying behavior.

Verified Answer :

Hello Annamaries01!

In human relations, the irritation threshold is the point at which a person notices something and becomes annoyed. So, the answer is B.

Cheers!
-Blizzard

Thank you for being part of the brainly community.