Explanation:

Correct option 1: Paton

- The statement, “The essence of right seems to me to be not legally guaranteed power by itself, but the legally guaranteed power to realize an interest”, talks about the true nature of legal rights.

- Paton: A renowned legal scholar, he emphasized the practical realization of interests through law and had similar views about the essence of rights.

- Allen: H.G. Allen is known for his contributions to legal theory, but this specific definition is not usually attributed to him.

- Friedmann: He focused on legal philosophy but didn't coin this particular statement.

- Bryce: James Bryce had important political contributions, but not this statement.