Which of the following statements might explain why people who live in mountainous areas are more likely to speak languages that are not spoken elsewhere? a. people in mountainous areas tend to develop languages that are more difficult to speak than languages developed in lowland areas.
b. people in lowland areas tend to avoid integrating other languages into their culture, thereby isolating mountain dwellers and their languages.
c. people in mountainous areas tend to be more isolated from other populations, so their local languages do not spread.
d. people in mountainous areas do not have any economic incentive to come down from the highlands, so their languages do not spread.