The correct statement is option C: Kazakhstan's capital was renamed Nur-Sultan in 2019 and reverted to its earlier name, Astana, in September 2022. The full chronology runs as follows: the city was called Akmola until 1998; it was renamed Astana in 1998 when it became Kazakhstan's new national capital, replacing Almaty; in March 2019, it was renamed Nur-Sultan to honour Nursultan Nazarbayev, the country's long-serving first president, shortly after his resignation from office; and in September 2022, under President Kassym-Jomart Tokayev, the name was changed back to Astana, restoring its 1998-2019 name. Option A is incorrect because it claims there was never any renaming at all, ignoring both the Akmola-to-Astana switch and the Astana-Nur-Sultan-Astana cycle. Option B is incorrect because it wrongly identifies Almaty as the current capital; Almaty was indeed Kazakhstan's capital before 1997-98 and remains its largest city today, but it has not been the political capital since the move to Astana. Option D is incorrect because it reverses the actual 2019 and 2022 events, wrongly stating that the Nur-Sultan renaming happened in 2022 and has persisted, when in fact 2019 saw the change to Nur-Sultan and 2022 saw the reversion back to Astana. This chronology is a frequent source of exam confusion because it involves three name changes within roughly 25 years, and candidates often either freeze the name at 'Nur-Sultan', not realising the 2022 reversal, or assume no renaming ever occurred. The clean revision takeaway is to memorise the full sequence in order: Akmola (until 1998) to Astana (1998) to Nur-Sultan (2019) to Astana (2022, current), and to keep this separate from Almaty's earlier, pre-1998 capital status.