Someone help me please. key word is clause!

The next question refers to the following passage. The sentences have been numbered to help you identify them more easily.
(1) As she was driving to visit her twin, Jayla had a strange feeling that something bad was going to happen.
(2) Meanwhile, Kayla had the same exact premonition.
(3) Worried about her sister, Kayla called Jayla's cell phone.
(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.

Which sentence features an INTRODUCTORY CLAUSE that explains why the main action happened?

a. Sentence 1
b. Sentence 2
c. Sentence 3
d. Sentence 4

Me asap it's an e2020 test and it's timedread the rough draft of a student's conclusion to anargumentative editorial.(1) year-round schooling would student achievement.(2) not so much information would have to be crammed intonine months. (3) furthermore, the elimination of long breaks, particularly summer break, would significantly reduce"learning loss" and the additional time wasted at thebeginning of each academic year to reteach previouslylearned material. (4) it is clear that year-round schooling students learn and retain more. (5) the united statesis not the only country to experiment with a year-roundschool schedule. (6) although many still claim that evidenceabout year-round school and its link to higher achievement isinconclusive, these people need to open their eyes and seethat students in these schools consistently score higher oncertain assessments than students who attend schools withtraditional nine-month calendars. (7) it is about time that wereplaced our outdated and inefficient school calendars. what revision would most strengthen sentence 1?