Arrange the following events in order of their occurrence:-

(A) Hong Kong Influenza

(B) Spanish Flu

(C) Asian Influenza

(D) First Population Policy in India

Choose the correct answer from the options given below:

The correct option is (B), (D), (C), (A).

To determine the correct chronological order, let us look at the year of occurrence for each event:
1. (B) Spanish Flu: This devastating global influenza pandemic occurred between 1918 and 1920.
2. (D) First Population Policy in India: India launched its first National Family Planning Programme (which served as its initial population policy framework) in 1952, making it one of the first countries in the world to do so.
3. (C) Asian Influenza: This pandemic, caused by the H2N2 strain of the influenza A virus, originated in East Asia and occurred between 1957 and 1958.
4. (A) Hong Kong Influenza: Also known as the 1968 flu pandemic, this outbreak was caused by the H3N2 strain and occurred between 1968 and 1969.

Arranging these years in ascending chronological order:
1918 (B) → 1952 (D) → 1957 (C) → 1968 (A)

Therefore, the correct sequence is (B), (D), (C), (A).