Bold-faced and italicized words help readers by

Ashowing cause and effect within a text.
Bindicating parts of speech and grammatical clues.
Cfocusing attention on important words and phrases.
Didentifying main plot points and important characters.

Verified Answer :

Bold-faced and italicized words are simple text formatting that
signifies emphasis on important words, concepts and details in a text. These
typographic tools are keys to draw the reader’s attention towards the
bold-faced or italicized words. So basically, it helps the readers by focusing
attention on important words and phrases. 

Answer:

The correct answer is C. focusing attention on important words and phrases.

Explanation:

I got 100% on the test.