Option 4. Neither I nor II is true. The statement talks about the relationship between exercise and tendency to catch diseases. Those who exercise regularly have a less probability of falling sick. From what is supplied we cannot gather that Exercise assures protection from diseases. The statement throws light at high probability to catch diseases does not guarantee protection. Therefore, conclusion I does not follow. Also from the statement we cannot deduce about the people who do not exercise. Therefore, conclusion II does not follows. Hence, option 4 is correct.