Which of the Following Would NOT Strengthen the Validity and Credibility

Which of the following would NOT strengthen the validity and credibility of a scientific study?

A) The study is published in a respected,peer-reviewed journal.
B) The results of the study have been replicated by other researchers.
C) The study is funded by a for-profit pharmaceutical company that has a financial interest in the study's results.
D) The study is the culmination of long-term research involving thousands of participants.