Final answer:
Conor's sense of infallibility in chess is a result of his self-confidence and competitive nature.
Step-by-step explanation:
The subject of this question is self-confidence. Conor's sense of his own infallibility refers to his belief in his abilities and the lack of error he perceives in himself. This self-confidence has contributed to his success at chess.
When it comes to chess, being confident in oneself is important because it helps players make strategic moves and take risks without hesitation. In chess, there is a need to think several moves ahead and make calculated decisions. Self-confidence allows Conor to trust his own capabilities and make effective choices on the chessboard.
The correct answer is A. competitive nature. Conor's sense of infallibility relates to his competitive nature, as it drives him to strive for success and overcome challenges in the game of chess.