Vitamin B-Complex is one of the vitamins that help our body to function properly. It has all the essential nutrients that helps convert food into nutrients in order to fuel and energized our body. Vitamin B-Complex is water-soluble, it means that it can be easily dissolved in water.
So the answer is : Complex.
My opinion will be x-ray but you can have a different opinion, can u plz mark this as brainliest.