Final answer:
Mel has a mechanic's lien on Ellen's car, allowing him to retain possession until payment for repairs is made. This type of lien secures payment for labor or materials provided to improve property.
Step-by-step explanation:
Mel, who owns a car repair shop, replaced the clutch in Ellen's car. Until Ellen pays for the repairs, Mel has a mechanic's lien on the car. A mechanic's lien is a security interest in the title to property for the benefit of those who have supplied labor or materials that improve the property. In this case, because Mel has provided repair services by replacing the clutch, he is entitled to retain possession of Ellen's car until she pays for her repairs as this form of lien allows the repair shop to keep the car as collateral against the amount owed.