Answer:
D. Dog sledding
Explanation:
The Iditarod Trail Sled Dog Race is an annual team sled dog race. Mushers and a team of 12 to 16 dogs (of which at least 6 must be pulling the sled at the finish line) cover more than 1,049 miles between 9 to 15 days on the Anchorage-Nome route. This race has been running since 1973, the first Saturday of March, to discover the best team of sled dogs.
