Answer:
D. If a month does not have 30 days, then the month is not June.Explanation:
let's analyze each statement to find out what would be the correct option
A. If a month is not June, then the month has 30 days
It is incorrect because we only know that if the month is June it has 30 days. We cannot assure you that if the month is not June, this condition is always met. For example: August
B. If a month does not have 30 days, then the month is June.
It is incorrect because it contradicts the condition they give us for a month to be June, which is If a month is June, then it has 30 days.
C. If a month is June, then the month does not have 30 days.
It is incorrect because it contradicts the condition they give us for a month to be June, which is If a month is June, then it has 30 days.
D. If a month does not have 30 days, then the month is not June.
It is correct since to be June the condition they give us is that it must have 30 days. If a month does not have 30 days, we know with certainty that this month is not June.