(B) During the cell cycle,the $S$ phase (Synthesis phase) is the period where $DNA$ replication occurs.As a result of $DNA$ replication,the amount of

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(B) During the cell cycle,the $S$ phase (Synthesis phase) is the period where $DNA$ replication occurs.As a result of $DNA$ replication,the amount of genetic material ($DNA$ content) in the cell doubles from $2C$ to $4C$,although the number of chromosomes remains the same.Therefore,the correct phase is the $S$ phase.