Question

Which of the following sentences uses a signal phrase to effectively introduce information from an outside source?

One of my sources stated that national parks are beautiful places to visit.
According to park ranger Sarah Johnson, national parks attract millions of visitors each year.
My aunt believes that visiting national parks can be an unforgettable experience.
National Parks are popular tourist destinations—Sarah Johnson.

Answer 1

According to park ranger Sarah Johnson, national parks attract millions of visitors each year.