The correct answers are B) They experienced periods of conflict, invasion, and warfare. D) They were heavily influenced by Buddhism.
The ways in which the Southeast Asian states similar were: they experienced periods of conflict, invasion, and warfare. They were heavily influenced by Buddhism.
When we are talking about Southeast Asian states, they are Thailand, Laos, Burma, Singapore, Malaysia, Brunei, Vietnam, and the Philippines. Approximately, 234,000,000 people live in the region and is a vast zone for trade and cultural exchange.
The presence of Islam in modern times has been considerably strong in Southeast Asia, except in Singapur.