Consider the following events and arrange them in chronological order :
1. World Heritage Day
2. World Thyroid Day
3. World No Tobacco Day
4. International Day of Light
Select the correct answer from the codes given below :

To arrange the events in chronological order within a calendar year, we identify their respective dates of observation:

• World Heritage Day: Observed on April 18 to raise awareness about the diversity of cultural heritage and the efforts required to protect and conserve it.
• International Day of Light: Observed on May 16, marking the anniversary of the first successful operation of the laser in 1960 by physicist Theodore Maiman.
• World Thyroid Day: Observed on May 25 to promote awareness and understanding of thyroid health and the advancements made in treating thyroid diseases.
• World No Tobacco Day: Observed on May 31 by the World Health Organization (WHO) to highlight the health risks associated with tobacco use.

The correct chronological sequence is 1 (April 18), 4 (May 16), 2 (May 25), and 3 (May 31), which corresponds to option B.