Correct Answer:
C. US
At the Tokyo Olympics, officially the 2020 Summer Olympics held in 2021 due to the pandemic, the United States (US) won the most medals overall. The US consistently performs strongly in the Olympics across various sports. Option C is correct. China (Option A) finished second in the overall medal count, while Japan (Option B) performed exceptionally well as the host nation but did not top the overall medal tally. The Russian Olympic Committee (ROC) (Option D) also had a strong showing but did not surpass the US in total medals.