Winning Team John C. Harsanyi, John F. Nash and Reinhard Selten were jointly awarded the Nobel Prize in Economics. The three professors were singled out for their unique contributions to game theory, derived from studies of games such as poker or chess, in which players have to think ahead and devise a strategy based on expected countermoves from opponents.

Based on that paragraph can we conclude that this sentence is true?
John C. Harsanyi, John F. Nash and Reinhard Selten have made contributions that are unique.

Choices:
(A). Yes;
(B). It's impossible to say;
(C). No;