|Question 16Verbal

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Text
Despite the fact that what is now known as the Carmichael number was first posited by Václav Šimerka, the number is named after the twentieth-century American mathematician Robert Carmichael. One might assume cases like this, where a discovery or concept is not named after the first person who discovered it, to be        they are counted among a litany of examples of Stigler's law.
Which choice completes the text so that it conforms to the conventions of Standard English?
rare on the contrary,
A
rare, on the contrary;
B
rare, on the contrary,
C
rare; on the contrary,
D