The correct option is (A)  chromatin .The nuclear substance composed of histone proteins and DNA isChromatin.Chromatin is the material of which chromosomes are composed. Chromatin is composed of DNA, RNA, and protein. Chromatin is a complex of DNA andproteinsthat makes up the cell nucleus's contents. It has the appearance of a tangled mass of fine threads and coils during interphase. During mitosis and meiosis, the chromatin threads coil and compact into visible chromosomes.The nucleoprotein fibres in nucleus of a cell is called chromatin. Chromatin contains DNA and some basic proteins called histones, some non-histone proteins and also RNA.Know more aboutChromatinhere:brainly.com/question/30938724#SPJ11...

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