We essentially have two some statements here, so we know that some environmentalists question the idea of exploiting natural features, and that some think that it would be wrong to destroy these features even if it is costly not to destroy them.
We don't really have much in the way of diagrammable statements, rather, we have two positions that some environmentalists hold. I personally would not diagram this question, but try to make sure that I have a good understanding of the two positions and figure what which of the answer choices logically follow.
Indeed, (B) describes the second statement, so we can infer that it is true.
