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the answer would be sentence three because if Kayla wouldn't have called Jayla, Jayla wouldn't have crashed
The sentence that features an introductory clause to explain the reason for the main action that happened is Sentence 4.
An introductory clause usually provides background information to enable the independent clause to convey the main action. In this scenario, the independent clause starts with "Jayla lost control ..." The dependent or introductory clause starts with "Because she took ..."
Sentences 1 and 3 also feature introductory clauses, but the main action did not happen therein.
Thus, it is only Sentence 4 that has the introductory clause, which explains the reason that the main action happened.
Learn more about introductory clauses at https://brainly.com/question/24453899