A) echinoidea
B) holothuroidea
C) ophiuroidea
D) asteroidea.
Correct Answer: B
Solution :
: Sea cucumber (holothuria) belongs to the phylum echinodermata (class holothuroidea). They possess soft-walled and fleshy body, no arms and spines, mouth anterior surrounded by retractile tentacles. They are marine.
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