A Friend Who Says That He Is an Astronomer Claims

A friend who says that he is an astronomer claims that he was outside at midnight a few weeks ago looking at Mercury. What should be your response?

A) "Oh, you must have been in Australia or South America since Mercury can be seen at midnight only from the southern hemisphere."
B) "You must be mistaken, because Mercury NEVER appears in our midnight sky."
C) "Really! Have you just purchased a new telescope? Mercury can be seen at midnight only through a telescope."
D) "Congratulations, you have been fortunate enough to see Mercury on a very rare occasion."