Which sentence from the passage best expresses the main idea of paragraph 2?
A.
"Parkour has become a popular art form in many cities around the world due to the many obstacles located around urban settings."
B.
"Traceurs, who pit their bodies against various types of obstacles, often risk physical injury, and safety is an important concern."
C.
"The ultimate goal of parkour is for a person to mentally and physically prepare to overcome any obstacle he or she may face."
D.
"While practicing parkour, a traceur route may take him or her over a large boulder, across several rooftops, or across the top of a wall."

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