He had been running for a very long time, he knew it was time to stop because he was what?\nOptions:\n- shortness of breath\n- sore feet\n- was cramping\n- leg cramps\n- becoming tired Let's give stream of consciousness first:
User
A person stops running when he feels tired. The one who runs for a very long time tends to get tired.
Therefore, the answer is becoming tired.
Assistant