Two scientists argue at a conference about human origins. Dr. Leo argues that the journal Nature portrays legitimate science with its article on African origins. Dr. Wertz argues that the Creation Museum in Petersburg, KY, portrays the real facts of human history. In response, Dr. Leo says that the Creation Museum's "facts" aren't facts at all. This debate portrays scientists engaged in:
A. a paradigm shift
B. normal science
C. boundary work
D. personal conflict