To avoid injury when you're putting an item down, proper technique involves:

I am not properly educated on this, but I do know you are always meant to lift and set things down by using your legs to either heighten or lower yourself and the item. You would do this by squatting, grabbing the item, and returning to a standing position, the opposite goes for setting it back down. Do NOT use your back, so don't bend over to do this.

1. a

2. a

3. c

4. d

6. b

there are all your answers!

hope this : )