Because various electrophoretic bands exist in lanes 3, 4, 5, and 6, all 4 individuals have different genotypes, hence D is the correct choice (A and B statements are correct).
Two bands are provided between 600 and 440 in Individual 3. (heterozygous). Individual 4 provides two bands, one is 600 and the other is around 500 (heterozygous).
A single band from individual 5 is around 550. (homozygous). Three bands are produced by Individual 6 during electrophoresis (heterozygous), every genotype contributes a separate band to the electrophoresis.
Therefore, three individuals are heterozygous, one is homozygous at the d1s80, the fragment in lane 2 is different by 10 repeat units.
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Your question is incomplete, but most probably your full question was,
A. the four individuals having the d1s80 genotype
B. three individuals are heterozygous, one is homozygous at the d1s80
C. the fragment in lane 2 is different by 10 repeat units.
D. A and B but not C.
E. A, B, and C.
The image of the agarose gel is attached.
