Which of the following features differentiates a dicot stem from a monocot stem?
A) the presence of a distinct pith and cortex in a monocot stem and an undifferentiated ground tissue in dicot stem
B) the presence of a distinct pith and cortex in a dicot stem and an undifferentiated ground tissue in monocot stem
C) the presence of conjoined vascular bundles in a dicot stem and radial vascular bundles in a monocot stem
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