The correct option is B Water-theme park
The places given in the picture are a city, a slum, a lake, and a water park, respectively. Out of these, a water-themed park uses a lot of water just for people to swim and play in. This is wasting water in many ways. So, a water park can be shut down to conserve water.
On the other hand, slums and cities face water scarcity, and a lake is a source of freshwater which needs to be conserved. Zoos have animals which need water, so they should not be closed.