Answer:
A. Seal them in a glass container in an atmosphere of argon (Ar) gas.
Because Argon is an inert/noble gas which do not react with other elements/radicals. Thus, best way to make two radicals/substance only react is to seal them in glass container consisting atmosphere of Argon (Ar)..
Note: I also dont know if it's correct answer.. Since I am just giving my logic.. I hope it will help you
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