A statement based question like this asks us to check each conclusion strictly against the words given, without importing outside assumptions.
Once Conclusion I is ruled out and Conclusion II is confirmed, only one option remains valid.
The correct answer is Only Conclusion II follows.
Before checking the options, it helps to recall why Rule 20 exists at all. Contingency fees are discouraged in the Indian legal profession because tying an advocate's payment to the result of a case can tempt the advocate to act in self-interest rather than give impartial, honest advice to the client. Keeping this policy purpose in mind makes it easier to test each conclusion.
Rejecting the three flawed options leaves a single valid reading of the statement.
The correct answer is Only Conclusion II follows.