Correct Answer: Option B

Explanation

 It is the chromatin threads that carry the genes in the cell. Chromatin is a complex of DNA and proteins that exists in a loose, thread-like form when the cell is not dividing. During cell division, this chromatin condenses to form chromosomes, which are more visible under a microscope. Genes, the functional units of heredity, are located on these chromatin threads. 

There is an explanation video available below.

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