Correct option is B
Option (b) is the correct order of the given sentence.
• The sentence starts with
“Before I”, which introduces a dependent clause and sets a condition.
•
“can help you” correctly completes this conditional idea.
• The subject
“I” must precede the main verb in the independent clause.
•
“must know all the facts” forms a grammatically complete and meaningful statement.
Correct sentence formed:
Before I can help you, I must know all the facts.
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