Final answer:
Racers who perform well in the Yukon 1000 are those who stay mentally and physically focused on the race.
Step-by-step explanation:
The correct answer is C. They stay mentally and physically focused on the race. According to the article, racers who perform well in the Yukon 1000 are those who maintain a high level of mental and physical focus throughout the race. This allows them to make strategic decisions and push through the challenges of the race.
Learn more about Factors contributing to success in the Yukon 1000 race