Aregion groups people together according to their traditions.
a. cultural
b. physical
c. climate
d. spatial

Cultural.

Explanation: Cultural region is a term used in anthropology and geography and makes reference to the aspects of culture that is associated with a group of people and the territory where they live. Different boundaries may be found according to the particular traditions, for example, religion, architecture or language.

could you go a bit more in depth with you question? it's quite hard to understand. as soon as you do that i will be glad to : )