In the final of the Fifa eWorld Cup, how many players participated in the competition held at London's O2 Arena?

The correct answer reflects the scale of participation in the FIFA eWorld Cup, which indeed involved a significant number of players globally. The figure of 20 million participants is accurate as it represents the extensive reach of the competition, indicating that many players engage in the initial qualifying rounds before narrowing down to the final participants who compete at prestigious venues like the O2 Arena in London. This number effectively captures the widespread popularity and accessibility of esports and FIFA’s gaming platform, confirming its status as a major event in the gaming community.

The other numbers, while impressive, do not align with recorded statistics for player participation in this specific event. The figures of 200,000, 2 million, and 200 million grossly misrepresent the scale of competition as it is known that FIFA's reach, while vast, does not extend into the hundreds of millions for player entries in this context.