Explanation:

- The Tokyo Paralympic Games took place in 2021, having been postponed from 2020.

- It featured athletes from numerous countries across the globe.

- ?? Option: 3, 164 countries took part in the Tokyo Paralympic 2020.

- Option: 1, 163 is close, but not accurate.

- Option: 2, 161 is too low.

- Option: 4, 162 is still lower than the actual number.

Considering the above explanations, the number of participating countries was 164.