Which sentence properly introduces a quoted source? A. Mathewson: "Fifty percent of today's high school graduates will attend college for at least one year."B. According to Mathewson, "Ten percent of college students will graduate within four years of beginning college."C. "When more than twenty-five percent of college students drop out, a college should take action."D. Mathewsons research has produced interesting conclusions. "Fifteen percent of college applicants are over 40 years old."

In report writing, or any case of technical writing, you must properly give credit to your resources or references. When you paraphrased the findings of another person, you can cite their work as references in the bibliography. But if you want to retain their statements word for word, you use quotation marks ("). Before doing so, you must use introductory words like "according to", "based on what he said", "and I quote", or any style that you want.

From the choices, the correct use of quotation would be letter B.