The correct answer is (d).
A decree is a court order that requires a party to do something or to refrain from doing something. Under the Code of Civil Procedure (CPC), a decree may be executed by the court which passed it or by the court to which it is sent for execution.
The Tehsildar is a revenue officer in charge of a tehsil, which is a sub-division of a district. The Collector is a revenue officer in charge of a district. The District Judge is a judicial officer who is the head of the district judiciary.
The Tehsildar, Collector, and District Judge are not empowered to execute decrees under the CPC. Only the court which passed the decree or the court to which it is sent for execution can execute a decree.
The court which passed the decree has the first right to execute the decree. If the court which passed the decree is unable or unwilling to execute the decree, the decree may be sent to another court for execution. The court to which the decree is sent for execution is called the executing court.
The executing court has the power to take all necessary steps to enforce the decree, including the attachment of property, the sale of property, and the arrest of the judgment debtor.