GWD 26-1

Q1

Nobody knows exactly how many languages there are in the world, partly because of the difficulty of distinguishing between a language and the sub-languages or dialects within it, but those who have tried to count typically have found about five thousand.

A. and the sub-languages or dialects within it, but those who have tried to count typically have found about five thousand.

B. and the sub-languages or dialects within them, with those who have tried counting typically finding

C. and the sub-languages or dialects within it, but those who have tried counting it typically find

D. or the sub-languages or dialects within them, but those who tried to count them typically found

E. or the sub-languages or dialects within them, with those who have tried to count typically finding

DE的 or 很明顯可以排除;

AC的 it 按照句意應該指代"languages", 所以 it 應該錯了吧 

so 正確答案是B嗎, 但是B那個 with 怎麼看怎麼怪,

大家選什麼啊  ?