Crossing over occurs at

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(C) During the pachytene substage of prophase-$I$ of meiosis,the homologous chromosomes form a bivalent or tetrad structure.This structure consists of

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Four strand stage

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(C) During the pachytene substage of prophase-$I$ of meiosis,the homologous chromosomes form a bivalent or tetrad structure.This structure consists of four chromatids (two chromatids per chromosome).Crossing over occurs during this stage,which involves the exchange of genetic material between non-sister chromatids of homologous chromosomes.Therefore,crossing over occurs at the four-strand stage.

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