The correct answer to this question is c. scientific methods. If an issue is socially controversial, this will provide the best objective information. Advertising wouldn't because it is biased to one product. School teachers will have their own opinions, and rumors are not based on facts. Scientific methods, however, are based on facts and investigations so it will provide an objective information. Thank you for posting your question. I hope that this answer helped you. Let me know if you need more help.
D: His mother contracts scarlet fever and dies
New York was visited by many people last year.
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Well,
An adverb clause mainly tells the following: how, when, why, to what extent, or how much about whatever word it is modifying.
None of them appear to have an adverb phrase except option C.
The phrase, "Before you go to bed," tells when you should make sure the oven is turned off.
