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a
are all diploblastic in nature
b
are all triploblastic in nature
c
can be either diploblastic or triploblastic
d
are all coelomates
answer is C.
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Detailed Solution
Radially symmetrical organisms may be diploblastic or triploblastic. Cnidarians, ctenophores and adult echinoderms are radially symmetrical organisms. Cnidarians and ctenophores are diploblastic in nature. Echinoderms are triploblastic in nature.Cnidarians and and ctenophores do not possess coelom but echinoderms do.