Answer: The syllable that should be accented in "celebration" is "bra".
Step-by-step explanation: The word "celebration" has four syllables: "cel", "e", "bra" and "tion". However, the syllable that should be accented is the third one, "bra". In that way, "bra" is the one that should be emphasized and pronounced longer and louder that the others. On the other hand, "cel", "e" and "tion" need to be pronounced softer and at a lower pitch than "bra".