(D) The correct answer is $D$. During the $zygotene$ stage of $prophase-I$ in $meiosis$,homologous chromosomes pair up in a process known as $synapsis

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(D) The correct answer is $D$. During the $zygotene$ stage of $prophase-I$ in $meiosis$,homologous chromosomes pair up in a process known as $synapsis$. This pair of synapsed homologous chromosomes is referred to as a $bivalent$ or a $tetrad$ (because it consists of four chromatids).