The correct answer is option 3: International Day of Yoga. The United Nations proclaimed 21 June as the International Day of Yoga. This day is dedicated to promoting physical and mental well-being through the practice of yoga. Yoga is an ancient practice that originated in India and has gained popularity worldwide.
Option 1: International Mother Language Day is celebrated on 21 February to promote linguistic and cultural diversity and multilingualism. It was proclaimed by the United Nations Educational, Scientific and Cultural Organization (UNESCO) in 1999.
Option 2: International Widows` Day is observed on 23 June to raise awareness about the rights and challenges faced by widows worldwide. It was recognized by the United Nations General Assembly in 2010.
Option 4: International Day against Drug Abuse and Illicit Trafficking is observed on 26 June to raise awareness about the global issue of drug abuse and illicit trafficking. It was proclaimed by the United Nations General Assembly in 1987.
Therefore, the answer provided in the question is correct.