When did Urdu become the national language of Pakistan?

A. 1947
B. 1956
C. 1962
D. 1973

The National language of Pakistan

Urdu is the national language of Pakistan. It is the national language of Pakistan since Pakistan is declared an independent state on 14 August 1947. The 1973 Constitution recognizes Urdu as Pakistan’s only national language. It also promises to make it the official language of the state.