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a
dorsal and ganglionated
b
ventral and ganglionated
c
dorsal and non-ganglionated
d
ventral and non-ganglionated
answer is B.
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Detailed Solution
Earthworm has a double, ventral and ganglionated nerve cord. Recall the difference between the CNS of chordates and non-chordates mentioned in the chapter Animal Kingdom of the NCERT textbook.