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Which sentence states the main idea of the passage?
a. A new unit of skiers was trained in Colorado to become soldiers during World War II.
b. Charles Minot Dole, founder of the National Ski Patrol System, helped recruit skiers during WWII.
c. At the beginning of WWII, the U.S. trained ski solders who went on to honorably serve their country.
d. Skiing increased in popularity after the end of WWII, when former soldiers worked to make the sport more accessible.
c. At the beginning of WWII, the U.S. trained ski solders who went on to honorably serve their country.