The sentence which uses correct punctuation is C. In time, of course, all issues get resolved, but not necessarily in the way you would like.
In A, the comma before <em>he was concerned </em>should be a dash. In B, there should be a colon before <em>a flashlight, </em>not a semi colon. In D, there should be a comma before <em>yet, </em>and not a colon.
Human activities contribute to climate change by causing
changes in Earth’s atmosphere in the amounts of greenhouse gases, aerosols (small particles), and cloudiness. The largest known
contribution comes from the burning of fossil fuels, which releases
carbon dioxide gas to the atmosphere. Greenhouse gases and aerosols affect climate by altering incoming solar radiation and outgoing infrared (thermal) radiation that are part of Earth’s energy
balance.
Answer:
“TRUE! --nervous --very, very dreadfully nervous I had been and am; but why will you say that I am mad?”
Explanation:
According to the excerpt from "The Tell-tale Heart", the narrator tries to convince the readers that he is not a mad man, even though his words and behavior seem to prove otherwise.
The narrator asserts that although he is nervous, he isn't a madman and it is buttressed in his statement where he said, “TRUE! --nervous --very, very dreadfully nervous I had been and am; but why will you say that I am mad?”