Explanation:

• Bangladesh initiated the idea to celebrate International Mother Language Day on February 21. The day was approved by UNESCO in 1999 and has been celebrated annually since 2000. 

Why is International Mother Language Day celebrated? 

• To promote the preservation and protection of all languages

• To promote multilingualism and cultural diversity

• To promote the use of mother tongues

• To save languages and the traditions they carry

• To promote learning through multilingual education

Background

• The idea for International Mother Language Day was suggested by Rafiqul Islam, a Bangladeshi living in Canada 

• The day commemorates the martyrdom of students who fought for the use of Bengali as their mother language in 1952 

• The United Nations General Assembly proclaimed 2008 as the International Year of Languages 

UNESCO's role

• UNESCO recognizes the importance of linguistic diversity for building sustainable societies. They work to preserve cultural and linguistic differences that foster tolerance and respect. 

Hence option 2nd is correct.