The correct answer is - In addition, forests provide natural beauty.
This is the only sentence that shows that the ideas from this example and the one before it are connected because they are similar. The other sentences show opposite ideas, by using connectors such as however, conversely (which means 'on the other hand'), and in contrast.
If there were more men in the world then there would be less kids because women produces children, if there were more women in the world, then there would be less differences.
