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a
Arthropoda, Mollusca and Cephalochordata
b
Hemichordata, Arthropoda and Urochordata
c
Nematoda, Mollusca and Urochordata
d
Annelida, Arthropoda and Echinodermata
answer is B.
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Detailed Solution
Circulatory system is of open type in Hemichordata, Arthropoda, Urochordata and EchinodermataIn Annelida, Cephalopoda of Mollusca, Cephalochordata and Vertebrata closed circulation is seen.In Nematoda, there is no circulatory system.