一道语法真题，麻烦大牛给解答一下，谢谢！

Unlike many United States cities, where a river is no longer the focal point of urban life, the river in San Antonio winds through the middle of the business district, and the River Walk, or Paseo del Rio, is the city’s most popular attraction.

(A)     Unlike many United States cities, where a river is no longer the focal point of urban life, the river in San Antonio

(B)     Unlike the river in many cities in the United States, which is no longer the focal point of urban life, in San Antonio the river

(C)     Today the river in many cities in the United States is no longer the focal point of urban life, unlike San Antonio, where it

(D)     In few United States cities today, a river is the focal point of urban life, but the river in San Antonio
                

(E)      No longer do many cities in the Unites States have a river as the focal point of urban life, but in San Antonio the river

答案是E，为什么不是B呢，请大牛帮忙解答一下，谢谢了！

不是NN

(B)     Unlike the river in many cities in the United States, which is no longer the focal point of urban life, in San Antonio the river

which 有修饰US之嫌，另外句子结构不对称，虽然用了unlike the river, the river， 但地点状语的位置有点别扭

unlike the river
            in many cities  ,.......,in San Antonio
            the river