Answer:
B
Step-by-step explanation:
It's B because a renewable resource is something that will last a long time, can be easily renewed, and doesn't have a negative effect on the environment. That's the river. A river has zero negative effects on the environment, it is easily renewed through either underwater springs, snow, rain, and/or other rivers, and the river will last a long time since river's have a lot of water (more than is needed for a hydro-electrical dam) and is being constantly renewed.