The correct option is C Nectar mixed with saliva (regurgitated) and stored in the honey sac
Honey starts as flower nectar collected by bees, which gets broken down into simple sugars stored inside the honeycomb. This nectar is regurgitated by the worker bee. It is delivered to one of the indoor bees and is then passed mouth-to-mouth from bee to bee until its moisture content is reduced from about 70% to 20%. This changes the nectar into honey.