In his study on the failures of the American educational system, Professor Harris states that over two million high school seniors in
this country are functionally illiterate, and at least as much as four million others cannot read at an eighth-grade level.
A. at least as much as four million others
cannot
B. at least as many as four million and more
cannot
C. more than four million of other students
are unable to
D. there was at least four million other
students unable to
E. more than four million others cannot
SOURCE: McGraw Hill
OE : E
Can someone please explain how "others" stand for "students" ?