Our journey took us to a region called the Dragon 's Spine , located in a high and rugged mountain range . Long ago , the dominant Han Chinese drove several minority ethnic groups out of the surrounding low lands . These groups then built their communities in the mountains , transforming the steep hillsides into terraces so that they could grow rice and other crops .
According to the above context, choose the best option to answer the following question.
Question: What did they do on their tour ?
Options:
A. Learned how rice and crops are grown
B. Walked up the hills in the mountains
C. None of the above choices .
D. Learned the history of the Areas they saw


D