Which sentence Correctly revises this sentence? I understand the concept now that she gave me some pointers.

Answer:
"Now that she gave me some pointers, I understand the concept."
Explanation:
The first option has a misplaced comma, the second has an unnecessary "but" included, and the final option conflicts its own structure by adding the unnecessary "because".
Answer:
(C) Now that she gave me some pointers, I understand the concept.
Explanation:
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