I would write it, "If we were teenagers at the time, these licenses would have signified our passage to adulthood." I hope that helps ^_^
I believe the answer is C
Answer:
C "Hence, more schools should follow the trend of starting later in the morning if they want to see improved test scores, greater attendance numbers, and, most importantly, healthier, happier teens."
Explanation:
I doubted it at first because it sounds too repetitive with sentence 13, but it makes more sense than the other options and relates to the argument and establishes a unified end as it summaries that more schools should have a later start time to help students succeed academically and improve their general wellbeing.