The correct statement about the water cycle is:
Energy for the water cycle comes from the sun.
The sun provides the energy necessary for processes such as evaporation and transpiration, which are key components of the water cycle. The other statements are inaccurate or misleading. For instance, water does change form (from liquid to vapor and vice versa), both plants and animals contribute to the water cycle, and there is no specific starting or ending point in the water cycle as it is a continuous cycle.