Concept: Section 9 of the Limitation Act states that once time has begun to run, no subsequent disability or inability to institute a suit stops it, except in the specific case provided by the section.
Step 1: Understand the general rule.
The general rule is:
\[
\text{Once limitation starts running, it does not stop}
\]
This means subsequent disability normally does not suspend limitation.
Step 2: Understand the exception.
Section 9 provides an exception where letters of administration to the estate of a creditor are granted to his debtor.
\[
\text{Debtor becomes administrator of creditor's estate} \Rightarrow \text{Limitation suspended}
\]
Step 3: Apply the correct option.
The limitation period is suspended only during the period for which such administration continues.
Therefore, the correct answer is option (D).