Emma's neighbors were gone for $2$ weeks in August. While they were gone, Emma voluntarily walked over to their yard and watered it every few days, watered their flowers, tended to their garden and just kept things looking nice. When the neighbors got home, Mr$.$ Neighbor said "Wow! That was really nice, Emma! Thanks so much! Tell you what, next time I see you I will give you $$100$ for all your hard work!"

Is Mr$.$ Neighbor's promise to pay $$100$ to Emma legally binding?

Group of answer choices

Yes provided Emma did the work with an expectation she would be paid for what she had done.

Yes.

Yes provided the $$100$ is considered a fair and reasonble amount of money for the work Emma did.

No$,$ the promise made to Emma is not legally binding.