Correct Answer:
C. 17 Days
Explanation:
The Tokyo 2020 Olympic Games (officially the Games of the XXXII Olympiad) were postponed to 2021 due to the global COVID-19 pandemic. Once commenced, the main competitive sporting window officially spanned exactly 17 days.
### Important Facts:
- Dates: Held from July 23 to August 8, 2021, in Tokyo, Japan.
- Motto: 'United by Emotion'.
- Fact: Despite being held in 2021, the event retained the name 'Tokyo 2020' for branding and historical consistency.