Final answer:
Fragment A has a higher molecular weight than Fragment B.
Step-by-step explanation:
During electrophoresis, the band with fragment A travels the same length along the gel as the band with fragment B. The band with fragment A is darker than the band with fragment B. From this, we can infer that Fragment A has a higher molecular weight than Fragment B. The darkness of the band indicates a higher concentration of DNA, which is likely due to the larger size of Fragment A.