In which sentence does the conditional express a habitual fact?

✂️ a) If Nancy said, "Jump!", Bob jumped.

✂️ b) If it rains, I?ll not go to the beach.

✂️ c) If someone?s at the door, it must be Peter.

✂️ d) Had I seen Dorothy, I would have given her the message.

✂️ e) I wouldn?t marry you if you were the last person on earth!

Responda: In which sentence does the conditional express a habitual fact?