This question turns on who under the Code of Civil Procedure, 1908 holds the power to transfer a pending civil suit from one district to another within the same state. Section 24 of the CPC vests this power in specified superior courts, and testing each option against the text of that section shows which choice survives.
Once every alternative is checked against the actual text of Section 24, the only option consistent with the law is that such a transfer is ordered by the High Court, since it alone possesses supervisory power over all subordinate courts across the districts of the state.
Therefore, the correct answer is By the High Court.