Correct Answer: (b) 2 only
Solution:International Mother Language Day was proclaimed by the General Conference of the United Nations Educational, Scientific and Cultural Organization (UNESCO) (not by UNICEF) in November 1999. The UN General Assembly welcomed the proclamation of the day in its resolution of 2002. Ekushe February, or simply "Ekushe", which is "The 21 in Bangla, commemorates the day in 1952 when students of the University of Dhaka launched a nationwide protest against the imposition of Urdu on the people of what was then East Pakistan.