SAT English Practice Question

The passage describes a scientific study about the effects of a particular treatment on a certain group of people. The author uses the word "however" to indicate a shift in focus from the overall results of the study to a particular aspect of the study. The author also uses the word "because" to explain why the study’s findings may not apply to everyone.

1. A.To introduce a contrasting idea to the previous sentence.
2. B.To emphasize the importance of the previous sentence.
3. C.To provide an example that supports the previous sentence.
4. D.To suggest that the author is unsure of the study’s findings.