A student is editing a formal research paper and finds the following sentence: "The researchers' analysis didn't yield conclusive results, so they couldn't confirm their initial hypothesis." Which of the following revisions BEST adheres to the conventions of formal academic grammar?
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A
The researchers' analysis did not yield conclusive results; therefore, they could not confirm their initial hypothesis.
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B
The researchers' analysis did not yield conclusive results, and they weren't able to confirm their initial hypothesis.
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C
Because the researchers' analysis did not yield conclusive results, they couldn't confirm their initial hypothesis.
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D
The researchers' analysis didn't yield conclusive results; therefore, they were unable to confirm their initial hypothesis.