一个小问题

(A)              lack math skills to such a large degree as to make it difficult to absorb them into a city economy becoming

(B)lack math skills to a large enough degree that they will be difficult to absorb into a city's economy that becomes

(C)              lack of math skills is so large as to be difficult to absorb them into a city's economy that becomes

(D)             are lacking so much in math skills as to be difficult to absorb into a city's economy becoming

(E) are so lacking in math skills that it will be difficult to absorb them into a city economy becoming