Given the fact "a cavern is formed by carbonic acid in groundwater seeping through rock and dissolving limestone", what is the answer to the question or completion "Kool-aid is a mix of what items as a solution?"

pick from the following.
+ water fluid within a sugar casing.
+ soda pop within a can.
+ sucrose crystals and flavors dissolved in liquid base of water.
+ sugar candy from store.
sucrose crystals and flavors dissolved in liquid base of water