Step 1: Understanding restitution of conjugal rights.
Restitution of conjugal rights refers to the right of either spouse to the company, consortium, and cohabitation of the other spouse. When one spouse withdraws from the society of the other without reasonable cause, the aggrieved spouse can seek a decree for restitution of conjugal rights.
Step 2: Legal provision.
Section 9 of the Hindu Marriage Act, 1955 provides that when a spouse has withdrawn from the society of the other without reasonable excuse, the aggrieved party may apply to the District Court for restitution of conjugal rights. The court may grant the decree if it is satisfied with the truth of the statements in the petition.
Step 3: Conclusion.
Hence, the correct answer is Section 9, which explicitly deals with restitution of conjugal rights.