Answer:
Correct answer is A). an influx of immigrants to an area .
Explanation:
Option A is correct because with the immigrants their religion, language, customs and many other cultural patterns are shaping the society they came to.
Option B is not correct as economical depression is not changing cultural patterns, but affects financial status.
Option C is not correct as this leads to different political arrangements.
D is not correct as it affects the climate not culture.