Explanation:

- Section 18: This section pertains to the place of institution of suits where local limits of jurisdiction of courts are uncertain. It details how to proceed when the location for suit institution isn't clear.

- Section 20: This section specifies where suits can be instituted, particularly when related to defendants residing in different jurisdictions. It deals with matters related to jurisdiction rather than the transfer of cases.

- Section 25: This section grants the Supreme Court the authority to transfer suits, appeals, or other proceedings from one High Court to another High Court or subordinate court in a different state. This decision can be made if it's in the interest of justice.

- Section 28: This part deals with the service of summons where the defendant resides in a different state, focusing on jurisdiction rather than transfer of cases.

Correct Answer: Option 3 - Section 25