Solution
✅ Correct Option: 1
A is correct: the passage calls democracy valuable because it allows change without destroying the system. B is correct: it describes democracy as "corrigible" and able to "reform themselves when experience exposes defects." C is correct: the passage contrasts democratic remedies with revolutionary change. D is incorrect: it explicitly says, "This is not an argument that revolution is indispensable." Therefore, A, B and C only are correct.