So we ran back , and then started walking again when we were near the entrance and the mosquitos lessened . We talked and watched the lake next to us . A train went by to our other side , slightly obscured by the trees , and we waved as it passed .
Why did they run back ?
Pick the best answer from the following options:
- None of the above choices .
 - So they could leave the park .
 - To get away from the mosquitos .
 - To catch up with the train .


To get away from the mosquitos .