|Question 3Verbal

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Text
When minor planets are discovered, each is given a unique identification number, and some may be given a unique name, as in the case of 1083 Salvia, which was named after the plant genus that includes sages. But naming a minor planet is not       : whether to assign it a name is entirely the choice of whoever discovers it.
Which choice completes the text with the most logical and precise word or phrase?
mandatory
A
feasible
B
permissible
C
selective
D