The words, "first," "second," and "third" serve as ________ in a speech

Senator McCarthy's lies and demagoguery persisted for four years until they were publicly challenged by __________ in a daring broadcast on CBS television

Fill in the blank with correct word

______ is a tool that allows journalists to make sense of all of these elements as they select from various social media feeds and add their own information to tell a story.

A. Twitter B. LinkedIn C. Storify D. Facebook