The DNA is very large, at least a thousand times more than the actual size of the cell so it needs to be in a compact form. This helps total DNA fit into the nucleus. Thus option B is correct.
What is the role of supercoiling?
The DNA is very long so for DNA packaging it needs to be compacted so that it can be transferred into the cell during the cell division. So, supercoiling is required during the DNA packaging process during the cell division that is during mitosis and meiosis.
The second role of supercoiling is during the synthesis of nucleic acid like DNA and RNA, As for that process the DNA need to be unwound and rewound needs to be done because of this it results in positive supercoiling and negative supercoiling respectively.
Hence, it is necessary that DNA needs to be supercoiled to fit into the nucleus and it also helps in the equal distribution of DNA in each cell during the nuclear division.
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