Suppose you were writing a summary of the article. Which would be most important to put in the summary?

Monopoly was a hit and Charles Darrow became a multimillionaire.
The game of Monopoly is about making money.
Parker Brothers was a company that made board games.
The purpose of Magie's board game was all but forgotten.

The most important point to include in the summary would be that Monopoly was a hit, making Charles Darrow a multimillionaire.