Answer:
B and D
Step-by-step explanation:
A theory represents an explanation of a natural phenomenon that has been tested over and over again by different researchers and found to be true.
Hence, when Dr. White got a result that is different from the established theory, it is possible that her study was flawed in some ways or there may be some other factors that influenced the results of previous studies on the same subject.
The previous studies that support the theory are less likely to be flawed because several independent researchers carried out the same research and arrived at the same result.
Hence, both option B and D are plausible conclusions for Dr. White.