Hailie Is Writing a Psychology Research Paper

Hailie is writing a psychology research paper. She has collected research from the past three decades, which her professor says is fine. What is confusing for Hailie is that her articles say different things. She finally asks you why all of the research has been published if some of it is obviously wrong. You tell her that

A) scientists rarely work together or review previous research, which can leave publications in disagreement with each other.
B) there is no review process in scientific publication; if someone writes well enough, the article will be published, regardless of its validity.
C) truth and reality are in the eyes of the beholder.
D) part of the scientific process is testing and retesting a theory, to see if everyone reaches the same results each time; if they don't, the research may not agree.