Which sentence is right?
A group of people that are
OR
A group of people that is
I am aware that there is this grammar rule concerning relative pronoun that states something along the lines if 'X of Y that ABC' then ABC must agree in tense of the Y and not the X. However, I am not sure if this is also applicable for a group of people that ... because a number of people that (in this case must be) are...
It would be great if you guys could help explain!