Explanation:

- Option 1: Sec. 10

- This section pertains to suits against trustees and their representatives. It specifies that there is no limitation period for such suits as long as the property remains in the hands of the trustee, the legal representative, or the assigns (not being assignors for valuable consideration).

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- Option 2: Sec. 11

- This section deals with the effects of possession of property belonging to the government but is not related to trustees.

- Option 3: Sec. 12

- This section generally provides for the exclusion of time in legal proceedings but does not specifically deal with trustees.

- Option 4: Sec. 13

- This section is about suits for the recovery of immovable property, not specifically against trustees.

In summary, the correct answer is indeed Option 1: Sec. 10, as it directly addresses the limitation period for suits involving trustees.