Final answer:
Sentence 4 contains the introductory phrase that explains the cause of the main action, which is Jayla losing control of her car due to being distracted by answering a phone call.
Step-by-step explanation:
The student's question refers to identifying the sentence with an introductory phrase that explains why the main action occurred. An introductory phrase sets the stage for the main clause of the sentence and often provides reasons or causes for what is described in the main clause.
In the given passage, the sentence that features an introductory phrase explaining why the main action happened is sentence 4: "Because she took her eyes off the road to answer the phone call, Jayla lost control of her car and crashed through the front of Kayla's house." The phrase 'Because she took her eyes off the road to answer the phone call,' clearly states the reason for Jayla's loss of control and subsequent crash.