A: To introduce the idea that McCandless's Father had complex reasons for leaving his family.
Explanation:
The paragraph directly states that "it didn't say why. I read it considerable in it bow and then. The statements was interesting but tough." That text supports in my answer on how.
There would be six bands on the electrophoretic gel. The linear strip would be cut twice by the EcoR1 and thrice by the HindII. That would be an equivalent of 5 cuts on a linear piece that would result in 6 pieces.