Step 1: Know the law.
The Arbitration and Conciliation Act, 1996 gives a fair and quick way to settle disputes. Section 25 deals with default by a party.
Step 2: Focus on Section 25(b).
Section 25(b) covers the situation where the respondent fails to file the statement of defence without sufficient cause.
Step 3: Note the key rule.
The tribunal shall continue the proceedings. But it shall not treat this failure as an admission of the claimant's allegations.
Step 4: Understand the reason.
Arbitration is built on fairness. If silence were treated as admission, unfair awards could be passed. So the claimant must still prove the case.
Step 5: Rule out wrong options.
Option A and B wrongly treat the silence as admission or accept the claim without proof. Option D, termination, applies to claimant default, not this.
Step 6: Final answer.
The tribunal continues the proceedings without treating the failure as admission.
\[ \boxed{\text{Continue the proceedings without treating such failure as admission.}} \]