Sociolinguistics 3, Exercise 1: dialectal or sociolectal?

soda / pop / coke       dialectal: they vary by region of the United States
                        (the page says dialectal, not sociolectal).
Tamil tanni / tirrto    sociolectal: the Mudaliyar and Iyengar differ by caste
                        (a social group), not by region.
Bokmal vs Ranamal       the page says these differences are not sociolectal
                        per se: they differ in pronunciation and morphology
                        between a standard and a local variety.

Source: Wikipedia, Sociolect. The distinction: dialects are tied to
geography; sociolects to class, age, gender or ethnicity.