Step 1: Understanding the Concept:
The question asks for the year of formation of the country of Bangladesh.
Step 2: Detailed Explanation:
Bangladesh was previously known as East Pakistan, a part of Pakistan since the partition of India in 1947. Due to political, economic, and linguistic discrimination, a liberation movement emerged. The Bangladesh Liberation War took place in 1971. Bangladesh declared its independence on March 26, 1971. The war ended on December 16, 1971, with the surrender of the Pakistani army, leading to the official establishment of the People's Republic of Bangladesh.
Step 3: Final Answer:
Bangladesh was formed as an independent nation in 1971. Hence, option (A) is the correct answer.