(a) an array of supplies, pencils, crayons, notebooks, erasers, and more, was required for the
first day of class.
(b) an array of supplies, pencils, crayons, notebooks, erasers, and more, were required for the first day of class.

An array of supplies, pencils, crayons, notebooks, erasers, and more, were required for the first day of class.

Explanation:

Why it is letter (b) is because since it is all plural, we need to make the verb plural. So (b) is your answer.

An array of supplies, pencils, crayons, notebooks, erasers, and more, were required for the first day of class.

"get off of your lazy bum and come running with me or i'm dumping this pitcher of water on u " u say with a smile. she thinks your joking so she ignores you about 10 seconds later shes screaming wile water is dripping everywhere you say "here comes the second one! " then you here her say okay, your such a j e r k ! ill be ready in 5 put the pitcher down " she say in an angry tone. and you smile in victory

good enough?