He took off in a flurry of great disgust . Kim and I shook our heads and decided to go ahead . As we rode down the narrow trail , I rang my little courtesy bell , feeling foolish . Needless to say , we made it just fine , although when we arrived at the crossroad of the main trails , we opted to leave the park and do the rest of our ride on the road .

Question: Why did he take off in a flurry of great disgust ?
Answer: Because we rode down the narrow trail .Because Kim and I decided to go ahead .Because he was very upset about something .Because Kim and I shook our heads .