Answer:
The 36th guest
Explanation:
To get the answer, firstly:
12 * 3 = 36
So that mean's that the 12th, 24 and 36th guest is getting a free pumpkin scented candle.
But if every 36th guest get's a carmel waffle scented candle, they match as the 36th guest will be getting both item's
(Hope this helps!)