Dr Kendig and Dr

Dr. Kendig and Dr. Kulkarni are both surveying teens about their use of tobacco. Dr. Kendig includes questions about vaping, cigarette smoking, and chewing tobacco in her survey. Dr. Kulkarni only asks about cigarette smoking. Dr. Kendig's research findings show a higher rate of tobacco use among teens compared to Dr. Kulkarni's research. The differences in their findings illustrates the point that

A) how you define a problem determines what facts you collect as you study it
B) research findings are inherently subjective
C) the personal interests of researchers have undue influence over their results
D) data are unstable and cannot be measured accurately