Gigi, as a Kind Gesture, Offers to Let Her Friend

Gigi, as a kind gesture, offers to let her friend, Bonnie, stay at her house for free instead of paying the high rent she is currently paying. Bonnie loads up her moving truck and terminates her current lease. When Bonnie shows up to Gigi's house with a full moving truck, Gigi decides she no longer wants her to stay at her house and turns her away. Does Bonnie have any legal recourse?

A) If Bonnie can show that she reasonably relied on Gigi's promise to her detriment, Bonnie may have legal recourse under under the concept of detrimental reliance.
B) No, because Gigi offered Bonnie a gift as both parties did not exchange something of legal value.
C) Yes, once a person makes an offer, they have to have the actual intent to follow through in good faith.
D) No because this would constitute an unjust enrichment to Bonnie if she did.