大全775请指教

775.        The main reasons for the phenomenal growth of agribusiness over the last fifteen years are because of elevated land prices, the basing of retail marketing networks on produce imported from other states, and decreased competition from developers.

(A) because of elevated land prices, the basing of retail marketing networks

(B) a result of elevated land prices, retail marketing networks based

(C) that land prices are elevated, retail marketing networks are based

(D) elevated land prices, retail marketing networks based（D）

(E) because land prices are elevated, the basing of retail marketing networks

答案是D没问题，但是retail marketing networks based这个BASED是什么意思呢，请NN指教。谢谢。

不是NN， 仅发表个人见解：based on 以某物为基础，在这里为零售市场网络以进口其他国家产品为基础、依据，不知对否？请nn指教！