Final answer:
The Yukon 1000 race is hard because racers spend almost the whole day paddling.
Step-by-step explanation:
The correct answer is D. Racers spend almost the whole day paddling.
The article mentioned that the Yukon 1000 race is difficult because racers spend almost the entire day paddling. This means they have to maintain physical stamina and endurance for long periods of time. The race covers a distance of 1000 miles, and participants have to paddle for several hours each day to complete the race.
For example, racers have to paddle through the night to ensure they make progress and reach the designated checkpoints. This requires mental and physical strength to stay focused and keep paddling, even in challenging conditions.
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