Step 1: Understanding the Concept:
ASEAN stands for the Association of Southeast Asian Nations. It is a regional grouping formed by countries in Southeast Asia to work together on economic growth, social progress, and regional stability.
Step 2: Fixing the date.
ASEAN was set up on 8 August 1967 in Bangkok, through the Bangkok Declaration, by five founding members: Indonesia, Malaysia, the Philippines, Singapore, and Thailand.
Step 3: Why the other options are wrong.
1961 is too early; the founding members had not yet agreed on a joint declaration. 1970 and 1971 come after ASEAN already existed, they are years of its early growth, not its founding.
Final Answer:
ASEAN was established in 1967. This corresponds to option (B).