On which country has the World Anti-doping Agency recently imposed a 4-year ban?

Russia

The correct answer is Option (1) - Russia

The World Anti-Doping Agency (WADA) imposed a 4-year ban on Russia in December 2019. This ban was specifically against a state-sponsored doping program and manipulation of laboratory data.

It's important to note that this ban concluded in December 2023. WADA doesn't publicly maintain a list of currently banned countries.