题目解析:
定位题干信息所在句子,在倒数第二句话,该句意思为:为了无情地操纵商业和控制领土,威尼斯保留了商船队作为海军预备队,并在需要时召集他们作战。优先结合前文内容考虑,本段第一句话是主旨句,威尼斯通过控制生产来操纵盐的交易市场;后续展开具体的控制方式,Venice had all saltworks on the Greek island of Crete destroyed, and it banned the local production of salt. The Venetians then brought in all the salt needed for local consumption, built stores to sell the imported salt, and paid damages to the owners of the saltworks. The policy was designed to control prices and at the same time keep the locals happy.破坏所有的盐厂,禁止当地的盐生产,建立商店出售进口盐,制定政策来控制盐价等;并为了进一步控制,保留商船作为军队预备,需要时召集作战;所以作者提到威尼斯商船的目的还是为了突出该策略作为一种方式来控制盐的市场交易,故而选 C。