A cephalopod with an external shell is

Sepia

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Nautilus

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Loligo

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Octopus

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Solution

The correct option is B Nautilus
The only cephalopod with an external shell is genus Nautilus. They are the most ancient cephalopod belonging to subclass Nautiloidea. Their shells resembles that of snail. They swim with it.
Thus, the correct answer is option B.

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