When Searching Using CINAHL, What Is the Main Advantage of Using

When searching using CINAHL, what is the main advantage of using a CINAHL Heading rather than a text word or phrase?

A) You can use it when you don't know how to correctly spell something.
B) Using a CINAHL Heading retrieves all articles about the heading topic, not just those with the exact word or phrase.
C) Using a CINAHL Heading limits the retrieval to research articles.
D) Using a CINAHL Heading allows you to use a Boolean operator.