Professor Pierrot Told His Class, "Clinical Research Must Be Replicable

Professor Pierrot told his class, "Clinical research must be replicable, relationships between variables must be clearly hypothesized and defined, and the measures used must be both reliable and valid." What additional characteristic should the professor include in his instructions?

A) Research data should be kept confidential, although conclusions should be shared with others.
B) Base rate data must be acknowledged.
C) The researcher's beliefs, attitudes, values, and emotions must guide the research.
D) It's important to be able to revise data that are collected.