Boundaries: Punctuation and Sentence Structure

SAT Reading and Writing· difficulty 3/5

______ you study the history of science carefully, you'll find that many great discoveries arose from accidents.

Which choice completes the text so that it conforms to the conventions of Standard English?

A
$Then$
B
$And$
C
$Therefore$
D
$If$
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Explanation

"If" introduces a conditional dependent clause that precedes the main clause with a comma. The others are coordinating conjunctions or adverbs.

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