Which of the following sections lays down the rule that the discretionary power of the court to grant specific performance is not arbitrary but sound and reasonable?

Section 20 of the Specific Relief Act, 1963 explicitly states that the court's discretion to grant specific performance is not arbitrary but must be exercised judicially based on sound and reasonable principles. This section prevents capricious or unfair use of the court's equitable powers. The discretion considers factors like adequacy of monetary damages, clean hands, and enforceability challenges.