A mixture containing DNA fragments a, b, c and d with molecular weigths of `a+b=c,a gt b` and `d gt c`, was subjected to agarose gel electrophoresis. The positions of these fragments from cathode to anode sides of the gel would be
A. B,A,C,D
B. A,B,C,D
C. C,B,A,D
D. B,A,D,C