Official Answer Key & Detailed Solution
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Correct Answer: Option (C) — 1 and 3 only
Concept & Option Breakdown
Standard Reference Verified- Brunei Darussalam joined ASEAN in 1984 as its 6th member.
- Laos joined ASEAN in 1997 along with Myanmar.
- East Timor (Timor-Leste) is not a full member (it holds observer status and was admitted in principle in 2022). Thus, at the time of the exam, only 1 and 3 were members.
East Timor is the newest country in Southeast Asia and had not yet acquired full ASEAN membership.
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