A normal Arabidopsis flower is composed of four concentric whorls. Which of the following is the correct order of whorls, starting from the outside and moving in?
A. carpels-petals-sepals-stamens
B. sepals-petals-stamens-carpels
C. petals-sepals-carpels-stamens
D. stamens-carpels-sepals-petals
E. carpels-stamens-petals-sepals
Answer: B
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