Which of the Following Statements Is True

Multiple Choice

Which of the following statements is true? 

A) When interpreting results of their studies,researchers generally seek to include some bias into their analyses. 
B) Scientific studies to investigate the same question can have different findings. 
C) Control groups are not as important to nutrition-based research studies as they are to other types of research.
D) A single-blind experiment is one in which neither the investigator nor the subjects know which treatment group each participant is a part of in the study.