(C) The correct answer is $C$. Ethidium Bromide $(EtBr)$ is a fluorescent dye used to stain $DNA$ in agarose gel electrophoresis. When exposed to ultr

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(C) The correct answer is $C$. Ethidium Bromide $(EtBr)$ is a fluorescent dye used to stain $DNA$ in agarose gel electrophoresis. When exposed to ultraviolet $(UV)$ light,the $EtBr$ molecules intercalate between the base pairs of the $DNA$,causing the $DNA$ bands to fluoresce orange,which allows for the visualization and study of $DNA$ fragments.