Which of the following country became the 11th member of ASEAN?

The correct answer is Option (2) → East Timor

In November 2022, at the ASEAN Summit in Phnom Penh, Cambodia, the leaders of ASEAN (Association of Southeast Asian Nations) agreed in principle to admit East Timor (Timor-Leste) as the grouping’s 11th member, and gave it observer status at ASEAN meetings until it meets the conditions for full membership. ASEAN was founded in 1967 and had ten members: Indonesia, Malaysia, the Philippines, Singapore, Thailand, Brunei, Vietnam, Laos, Myanmar and Cambodia. Vietnam, the Philippines and Laos are among those ten.