The correct option is B South Korea
The Association of Southeast Asian Nations is a regional intergovernmental organisation comprising ten Southeast Asian states which promotes Pan-Asianism and intergovernmental cooperation and facilitates economic, political, security, military, educational and socio-cultural integration amongst its members and Asian states. Since its formation on 8 August 1967 by Indonesia, Malaysia, the Philippines, Singapore and Thailand, the organisation's membership has expanded to include Brunei, Cambodia, Laos, Myanmar and Vietnam.