Mike is intoxicated and is involved in a severe car accident.Mike is rendered unconscious as a result of the accident.An ambulance arrives and drives Mike's lifeless body to the ER.Mike makes a full recovery.Four months later, he receives a bill from the ambulance service.Mike pays the bill.Which best explains his business relationship with the ambulance service?

Group of answer choices

He entered into an implied contract with the ambulance service

He has no business relationship with the ambulance service

He has given the ambulance service an unjust enrichment

He entered into a unilateral contract with the ambulance service