Explanation:

- Option 1, Land reforms:

- Refers to changes in the rules governing land ownership, aiming to enhance distribution equity and agricultural productivity.

- An institutional factor as it deals with policy changes affecting agriculture.

- Option 2, Electricity:

- Essential for agricultural processes like irrigation and storage.

- More of an infrastructure factor rather than institutional.

- Option 3, Size of fields:

- Impacts productivity and efficiency in farming.

- Considered an institutional factor as it relates to land distribution and policy.

- Option 4, Land tenure:

- Involves rights and agreements regarding land ownership and use.

- Strongly institutional since it governs how land is accessed and utilized.

- Correct Answer: Option 2, Electricity