Which of the following situations require the use of quotation marks?

When a writer wants to gain credibility by citing experts in the field

Are there supposed to be options?

Anyhow, you use quotation marks when you're quoting another person or when you're quoting a phrase. Also, you can use it when a person (s) are speaking. An example would be ...

Rosa said, "Mac and cheese is the best food on earth."

Or

Rosa said, "Mac and cheese is the best food on earth." Henry gave a look of disgust and said, "I disagree. Pizza is the best food."