The opening line mentions that the study revealed something. Hence down to C and D.
C) The first is the result of an analysis; the second weakens the possibility of doubt with regards to the accuracy of that analysis.
D) The first is a correlation between two entities; the second is evidence that directly strengthens the existence of that correlation.
The first BF is the result of a study and the second BF mentions that various factors were considered and then a conclusion was obtained. Hence
...
C) The first is the result of an analysis; the second weakens the possibility of doubt with regards to the accuracy of that analysis.
D) The first is a correlation between two entities; the second is evidence that directly strengthens the existence of that correlation.
The first BF is the result of a study and the second BF mentions that various factors were considered and then a conclusion was obtained. Hence
...



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