What is the main idea of this selection?
A. As its popularity grows, new indoor bouldering facilities are being built, making bouldering an increasingly accessible sport.
B. Young people are more proficient at competitive bouldering than adults because they are smaller and more agile.
C. Opening an indoor bouldering facility is a good business venture since the sport is becoming more widespread.
D. Bouldering athletes who train outdoors are more skilled than those who train indoors because outdoor bouldering is more challenging.
What is the main idea of this selection?
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The main idea of the selection is A: As its popularity grows, new indoor bouldering facilities are being built, making bouldering an increasingly accessible sport.
Explanation: This option encapsulates the overall trend of bouldering becoming more popular and accessible due to the establishment of new facilities, highlighting the growth and development of the sport in general.