Context: Every other kind of sport had people outside ; hikers , bikers , boaters , rollerbladers , you name it . So where did the rock climbers go ? Now that there are indoor climbing walls , has everybody who likes to climb moved indoors ?
Question: Why do n't rock climbers climb outside anymore ?
Option 0: None of the above choices .
Option 1: They want to get more fresh air .
Option 2: There is nothing to climb outside .
Option 3: Indoor rock climbing walls are more convenient .
Answer: 3