To support an argument that school start time should be later, the most effective piece of evidence would be:
A quotation from a newspaper describing what kids need for a healthy sleep schedule.
This type of evidence provides research-based information on the importance of adequate sleep for children's health and academic performance. It establishes a factual basis for the argument and highlights the consequences of insufficient sleep, making it more compelling.
The other options, while potentially useful, are more subjective and may not carry the same weight. For example, personal experiences or preferences expressed by parents, teachers, or students do not necessarily provide the broad, evidence-based perspective needed to support a systemic change like adjusting school start times.