What is the most logical next event?

A water jug, five lemons, some sugar and a boiling pot are placed on the stove top. The man takes spoons full of sugar and adds it to boiling water. then the woman

Pick your answer from: I. pours the mixture into a pot sitting on the stove and stirs.. II. pours add some of the water and add it to the pot.. III. heats the solution on the stove as she gently stirs it with a plastic spoon.. IV. adds water and added sugar to the pot, then added some water..
III.