4B

Do you think Tony was being childish where Mrs Saifre was concerned, as she said to him?

I can think of many modifiers for Tony, most not complimentary, she is just playing him, calling him childish.

No but I think he was put on guard against her as he knew she was very powerful in her presence.

No. He is being understandably very wary given their history.

No. I think he’s being decidedly sensible.
She’s the one who’s acting childishly, by saying this to try to rile him.

No... He can't and shouldn't trust her. They aren't friends by any stretch of the imagination.