Same fact pattern as Question 22 (re-pasted here so you don't have to go back). I send out a group text to my friends and family offering $1,000 to the first person who picks me up when I am stuck on a broken-down metro train. My sister immediately texts me saying that she'll come get me when she gets off work (but I am stressed trying to figure things out so I don't respond to her). My best friend immediately heads out to pick me up. When my best friend is almost there, she calls me to let me know that she is close, but I don't answer her call so she leaves a voicemail telling me this. In the meantime, a random stranger, who does not know about the $1,000, offers me a ride home, which I gratefully accept. Regardless of whether I have a contract with anyone, do I owe money to anyone? Question options: No, I didn't have a contract with anyone so I don't owe money to anyone. Yes, the sister since she was the first one to respond. Yes, the stranger since he/she performed the contract. Yes, the best friend since she substantially performed