Explanation:

- Option 1: (1)

- This part of the sentence, "It is," introduces the statement and is grammatically correct.

- Option 2: (2)

- This part, "a secret," is grammatically fine within the context of the sentence.

- Option 3: (3)

- The phrase "between he and I" is incorrect. In standard English, the correct expression is "between him and me" because the preposition "between" requires the use of object pronouns.

- Option 4: (4)

- "No error" would not be correct, as there is an error identified in part (3).

- Correct Answer: Option 3

- The correct version of the sentence should be "It is a secret between him and me."