Me . i currently have a d in this class way

Does anyone know the answer to the question?

Context clues can be definitions, examples, synonyms, or antonyms. the word root can give you an idea of the word’s meaning. affixes can you determine the word’s form and meaning. use the drop-down menus to identify the root in each difficult word. automatic: gratify: untenable:

During the industrial age, what was one important way businesses told consumers about new products? through phonographs through telephones through telegraphs through catalogues