Step 1: Understanding the question.
The statement discusses the effectiveness of a smoking ban, indicating that while the intention behind it is good, it may not be effective. We need to determine which conclusions logically follow.
Step 2: Analyzing the conclusions.
- Conclusion I: "Good intentions do not always yield desired results." This conclusion logically follows from the statement, as it discusses the possibility that the smoking ban, despite being well-intentioned, may not be effective.
- Conclusion II: "It is impossible to regulate public spaces." This conclusion does not directly follow. The statement does not imply that regulating public spaces is impossible, only that the smoking ban may be ineffective.
Step 3: Conclusion.
The correct answer is (A) Only I follows, as it is the only conclusion that directly follows from the statement.