What is the best method an author can use to convince readers?

Plagiarism can be avoid by a. copying and planting articles found online b.using language directly from outside resources c.using mla format to cite source d.changing a few words when quoting another writer

Select the correct answer. which headline do you think is most likely to be effective? a. if you want to stay healthy, take xyz for breakfast, lunch, and dinner b. stay fit, stay healthy with xyz c. health and fitness d. xyz is the magic solution for your entire family to stay fit and healthy e. xyz is your solution for all health and fitness problems

What is the italicized part in the sentence , all of the operators are efficient.