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Which one of the following groups of animals is correctly matched with its one characteristic feature without even a single exception?

A)  Reptilian: possess 3 - chambered heart with one incompletely divided ventricle

B)  Chordata: possess a mouth provided with an upper and lower jaw

C)  Chondrichthyes: possess cartilagious endoskeleton  

D)  Mammalia: give birth to young one.