Respuesta :
The sentence that properly introduces a quoted source is; Option B. According to Mathewson, "Ten percent of college students will graduate within four years of beginning college."
How to Identify a quoted Source?
When writing any report or technical report, it should noted that the writer must give due credit to his/her resources or references.
Now, when you paraphrase the findings of another person, you are supposed to cite their work as references in the bibliography. However,if you want to retain their statements word for word, you must use quotation marks (") after you have used introductory words like "according to", "based on what he said", "and I quote", or any style that you want.
Thus, applying the rule above, we cans ay that the sentence that properly introduces a quoted source is; Option B.
The missing options are;
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."
Read more about Quoted Source at; https://brainly.com/question/25759088
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