Answer is A is correct. This is a simple principle which states that an interest on loan cannot exceed the actual principal amount. Therefore option (a) is the correct answer.

Answer is B is correct. Section 29 deals with service of foreign summonses. Summonses and other processes issued by any Civil or Revenue Court established in any part of India to which the provisions of this Code do not extend or by any Civil or Revenue Court established or continued by the authority of the Central Government outside India or by any other Civil or Revenue Court outside India to which the Central Government has, by notification in the Official Gazette, declared the provisions of this section to apply, may be sent to the Courts in the territories to which this Code extends, and served as if they were summonses issued by such Courts. Therefore option (b) is the correct answer.

Answer is C is correct. Section 25(4) of C.P.C. states in dismissing any application under this section, the Supreme Court may, if it is of opinion that the application was frivolous or vexatious, order the applicant to pay by way of compensation to any person who has opposed the application such sum, not exceeding two thousand rupees, as it considers appropriate in the circumstances of the case. Therefore option (c) is the correct answer.

Answer is A is correct. Notwithstanding anything in this Part, the Court shall not order the arrest or detention in the civil prison of a woman in execution of a decree for the payment of money as per Section 56 of C.P.C. Therefore option (a) is the correct answer.

Answer is D is correct. Section 51 lays down the methods for enforcing execution of the decree. Appointing a commission for execution of the decree is not a method of execution. Therefore option (d) is the correct answer.