[求助]一道白勇语法题

靠..我还是10提错7提....现在请好心人帮我解答一下下面这题啊..DE之间为什么选择E不是D...

11.The growth of the railroads led to the abolition of local times, which was determined by when the sun reached the observer's meridian and differing from city to city, and to the establishment of regional times.

D: determined by when the sun reached the observer's meridian and differed

E: determined by when the sun reached the observer's meidian and differing

主动用 doing嘛．