Question

Which of these would cause two groups of people who lived a few miles apart to develop different languages?

a mountain range
similar cultures
use of fire for cooking
trade and commerce

Answer 1

Any ideas?

Answer 2

Two groups of people who trade and commerce with each other's groups are prone to learn each other's language. Try again :)

Answer 3

Similar cultures are more likely to know the same language. Although there's cultures that exists that one can be the same but the language is different, a culture tends to have the same language but not for all the cultures.

Answer 4

I guess so.