Which group of individuals is acting as a lobby group?

A.
News anchors continuously cover the latest breaking news story in up-to-the-minute details.
B.
A state association of teachers meets with members of the legislature to encourage them to support pending legislation.
C.
Neighbors meet every week to discuss the ongoing issue of building a park and a pool at the end of their street.
D.
A group of mothers goes on the local news to introduce their idea to create an after-school program.