Which of the following is MOST likely to connect a cultural region?

Language

Political boundaries

Public services

Birthrates

Roads

Language is most likely to connect a cultural region because communication is the key to everything.

Language

Explanation:

A cultural region or a cultural sphere or a cultural area refers to the geographic region where one type of or homogeneous activity is performed and is often associated with the ethnographic groups and the territory it inhabits and thus is characterized by a substantial uniform environment and culture.