The Permanent Settlement was a land revenue system implemented by the British in colonial India. It was initially introduced in Bengal, Bihar, and Orissa in 1793. However, it was rarely extended to other regions for several reasons.

Firstly, option 1 states that the Permanent Settlement disallowed an increase in the State`s share of agricultural prices. After 1810, when agricultural prices increased, the value of the harvest also increased. This meant that the State`s share would have also increased if the Permanent Settlement was extended. Therefore, the system was not extended to other regions due to the financial disadvantage it would have posed to the State.

Option 2, on the other hand, suggests that the economic theories of Ricardo influenced policy makers. However, it does not provide any specific explanation on how this influenced the decision to not extend the Permanent Settlement.

Finally, option 3 suggests that the State found it expedient to settle directly with the ryot (peasant). This implies that the State preferred to have direct control and interaction with the peasants rather than relying on a fixed revenue system.

Considering all of these factors, the correct answer is option 4, which states that all the given options played a role in the Permanent Settlement not being extended to other regions.