As you read the excerpt below, identify the ideas that would be included in a summary of the passage. Worn deep and wide by the migration of three hundred thousand people, lined by the graves of twenty thousand dead, witness of romance and tragedy, the Oregon Trail is unique in history and will always be sacred to the memories of the pioneers.

Which sentence represents the main idea and therefore must be included in a summary?
A There will never be another place like the Oregon Trail in our country’s history.
B Pioneers believe the Oregon Trail to be sacred because 300,000 traveled it.
C Travel along the Oregon Trail was a unique and meaningful event in American history.
D So many people used the Oregon Trail that it became worn down.