The question asks what the arbitral tribunal must do under Section 25(b) of the Arbitration and Conciliation Act, 1996, when a respondent fails, without sufficient cause, to submit a statement of defence. Each option can be checked against the balance the section strikes between efficiency and fairness.
Only continuing the proceedings while withholding any inference of admission matches the wording and the underlying policy of Section 25(b).
Therefore, the correct answer is Continue the proceedings without treating such failure as admission.