Explanation:

- Option 1: He is

- The phrase "He is" is grammatically correct. It forms the subject and part of the verb "is," which appropriately links to the adjective phrase that follows.

- Option 2: too immature

- This part correctly describes the subject with the adjective "immature," intensified by "too." No error here.

- Option 3: the situation

- This phrase is correctly structured as the noun phrase, acting as the object that requires handling.

- Option 4: for handle

- This segment is incorrect. The phrase should be "for handling" instead of "for handle." It is the verb form that is incorrect; it needs to be a gerund (verb+ing) to function correctly.

- Correct Answer: Option 4 - for handle.

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