Answer : 3. "24 जनवरी "
Explanation :

Every year 'National Girl Child Day' is celebrated on 24 January across the country. Its objective is to spread awareness about the rights of the girl child and the issues faced by them. This day was started in the year 2008. At present, many schemes are running in the country to support the rights of girls, in which schemes like 'Sukanya Samriddhi Yojana', CBSE Udaan Yojana, and 'Beti Bachao, Beti Padhao' are prominent.