题目解析：
本题为典型的反向推理题。根据定位词“sixteenth century”可以定位到这句话“He so enhanced the reputation of English business in that region that English merchants could operate on credit---the most prominent achievement for sixteenth century.”这句话的意思是“他也在那个地区提升了英国商业的声誉，让英国商人们可以贷款经营——这是16世纪最显著的成就。”选项中只有D提到了和credit有关的内容。我们通过反向推理可以得知：如果operate on credit是16世纪英国商业的一个显著的成就，那么也就是说明16世纪其它地区还不能够operate on credit，所以D选项完全正确。
A选项中，根据“Spain”定位到第一句话“The English textile trade was closely dyed to Antwerp, in the Spanish Netherlands, where workers died English cloth.”但该句只提到英国纺织品在Spanish Netherlands染色，并未提到由Spain控制。
B选项在文中未提及，本段并未提到纺织品经济利益相关内容。
C选项说来自欧洲各国的商人很少在同一区域经营，这在本段没有明显提及，故排除。
The English textile trade was closely tied to Antwerp, in the Spanish Netherlands, where workers dyed English cloth. The entrepreneur Sir Thomas Gresham became England's representative there. He so enhanced the reputation of English business in that region that English merchants could operate on credit---the most prominent achievement for sixteenth century. He also advised the government to explore the economic possibilities of Americas, which led to the first concerted efforts at colonization, undertaken with commercial profits in mind. 
