Is one of this sources more believable than the other as evidence about the effects of the dam? explain your answer.

Yes. Source D is more believable because Source C is from a book that “Criticizes the building of the dam”. It is only a comment by a journalist and source D is information that was released by the Chinese government itself. Source D also gives a more detailed explanation about what will happen because of the project.

White dwarf is very hot, but also very small and that is why it may appear dim.