Behavior that violates significant social norms is called
a.
rude.
c.
deviant.
b.
a stigma.
d.
none of the above

Behavior that violates significant social norms is called: Deviant

The behaviors that categorized as  would be depended on the culture of the society where the behavior is conducted. For example, sitting positions that shows the soles of your feet would be considered as acceptable in united states but would definitely considered as a defiant behavior if conducted in country such as Dagestan.

It would be C- Deviant.

i would say b. research typically uses a variety of sources

a) which ethnic groups live in this community?

i just took test