Answer:
Josh used reliable sources to support the arguments he used in the editorial.
Step-by-step explanation:
We can say that the arguments used by Josh in his editorial are correct and reliable. That's because he used reliable sources such as pediatricians and schools that had good results applying the later schedule to support the editorial.
A reliable source is one that is produced by experts in the field and people who have tested and can confirm it scientifically and with evidence.