Explanation:

- The statement “The Capital fact in the mechanism of modern states is the energy of legislature” was said by Sir Henry Maine.

- Sir Henry Maine (Option 3) was a distinguished British jurist and historian. He is known for his work on the evolution of law and for highlighting the shift from status to contract in societies.

- Savigny (Option 1) was a German legal scholar who emphasized custom and tradition in law.

- Puchta (Option 2) was a student of Savigny and also supported the historical school of jurisprudence.

- Ihering (Option 4, sometimes spelled Jhering) advocated for the purpose of law and its social utility, rather than just tradition.

- The key focus of Maine’s thought was on the dynamic role of legislative power in shaping modern states.

Option 3: Maine is the correct answer.