What is the best way to change this sentence from active voice to passive voice?

You need to pack the supplies, the food, and the first aid kit before the camping trip.
*
The supplies, the food, and the first aid kit all need to be packed before the camping trip.
You probably should pack the supplies, the food, and the first aid kit before the camping trip.
Someone needs to pack the supplies, the food, and the first aid kit before the camping trip.
Before the camping trip, you need to pack the supplies, the food, and the first aid kit.

The supplies, the food, and the first aid kit need to be packed before the camping trip.

Which sentence is written in active voice?

*
First prize at the science fair was presented by the mayor.
The scientists discovered a new way to fight the common cold.
The famous ice cream shop was owned by Angel's grandfather.
The best essay was written by the newest student in class.