In pachytene,each tetrad contains

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(C) During the pachytene stage of meiosis-$I$,homologous chromosomes pair up to form a bivalent or tetrad.Each bivalent consists of two homologous chr

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Four chromatids

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(C) During the pachytene stage of meiosis-$I$,homologous chromosomes pair up to form a bivalent or tetrad.Each bivalent consists of two homologous chromosomes.Since each chromosome has already replicated during the $S$-phase,it consists of two sister chromatids.Therefore,a tetrad (bivalent) contains a total of $4$ chromatids (two from each homologous chromosome).

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