C the subheadings tell what each section is about
A hoax is just fooling people. A joke, a fraud. Something that isn't true. A deception. It can be humorous or make people feel bad, so it could be either C or D. I can't tell which it would be but it could be both.
Answer:
Machines have eliminated low-skill jobs because they have done the work the people used to be doing themselves. For example the cotton gin, replaced people having to pluck cotton off of bushes.
Explanation:
The correct answer to the given question above is the content of "What Exactly Are Green House Gases". The author in the story "An Inconvenient Truth" uses the content of "What Exactly Are Green House Gases" to emphasize how humans can improve the atmosphere.
