For Question 1, the correct response would be:
the exchange of ideas and religions through cultural diffusion.
This suggests how different religions became dominant in various countries as a result of the interaction and exchange of cultural ideas and practices over time.
For Question 2, the best response is:
Southeast Asia is home to many different religious and belief systems.
This accurately reflects the region's diversity in religions such as Buddhism, Islam, Christianity, Hinduism, and various traditional belief systems.