Nur-Sultan is Capital of which of the following country?

A. Turkmenistan
B. Kazakhstan
C. Azarbhaijan
D. Kyrgyzstan

The new capital city of Kazakhstan

Nur-Sultan is the capital city of Kazakhstan. Known between 1998 and 2019 as Astana and before that Akmola, it was renamed Nur-Sultan in March 2019, in honour of the departing Kazakh president, Nursultan Nazarbayev. Wikipedia