Which sentence uses the word benign correctly?

Responses

The food at the restaurant is benign and potentially dangerous.
The food at the restaurant is , benign, and potentially dangerous.

The benign dog helped scare away the feral cats.
The , benign, dog helped scare away the feral cats.

The stranger’s benign act enabled several people to eat at the café.
The stranger’s , benign, act enabled several people to eat at the café.

The mother's benign ironing burnt a hole in the little girl's dress.

The mother's benign ironing burnt a hole in the little girl's dress.