Step 1: Analyzing the Statement
The statement says that "morning walks are good for health." This only provides information about morning walks but does not imply anything about the necessity of healthy people going for a morning walk or about the harms of evening walks.
Step 2: Evaluating Conclusion I
Conclusion I states that "all healthy people go for a morning walk." The statement only claims that morning walks are good for health, not that all healthy people practice it. Therefore, Conclusion I does not follow from the statement.
Step 3: Evaluating Conclusion II
Conclusion II states that "evening walks are harmful." The statement does not mention anything about evening walks or their effects on health. It only discusses the benefits of morning walks. Therefore, Conclusion II does not follow from the statement.
Step 4: Conclusion
Since neither conclusion I nor conclusion II is supported by the statement, the correct answer is (3) Neither conclusion I nor II follows.