Which best describes a legend?

a.
a story that has been passed down over the years and contains facts about events that happened during the middle ages

b.
a nonfiction story that has been passed down over the years that may contain facts and illustrations of real people

c.
a story that has been passed down over the years and may contain historical facts and characters but is largely fiction

d.
a true story that has been passed down over the years and contains facts about people who really lived