The majority religions of the countries you mentioned are as follows:
- Philippines: c. Christianity (predominantly Roman Catholic)
- Malaysia: d. Islam (Islam is the official religion)
- Indonesia: d. Islam (the country with the largest Muslim population in the world)
- Thailand: a. Buddhism (predominantly Theravada Buddhism)
So, the correct answers based on the majority religion for each country would be:
- Philippines: c. Christianity
- Malaysia: d. Islam
- Indonesia: d. Islam
- Thailand: a. Buddhism