Concept:A book launch is the official event held to introduce a newly published book to the public.Explanation:The phrase “book ______” refers to the occasion where the reviewer performed well.In English, the correct term for such an event is “book launch”.The word “premiere” is reserved for the first public showing of a film or play, not for a book.“Session” suggests a meeting or period of activity, which does not match the idea of presenting a new book.“Briefing” means giving instructions or information, so it is also not suitable here.Therefore, only “launch” fits naturally and correctly in the sentence.Answer:A. launch