If a cell with genome of 20 pairs of chromosomes undergoes normal __mitosis__, how many cells result, and how many chromosomes are in each of the resulting cells?
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A. Two cells, each with 20 chromosomes
B. Two cells, each with 40 chromosomes
C. Four cells, each with 10 chromosomes
D. Four cells, each with 20 chromosomes
E. Four cells, each with 40 chromosomes