Choose your most preferred answer regarding the motion of the Earth and the Sun:
    A ) we think the Earth goes around the Sun because that's what everybody has told us
    B) we think the Earth goes around the Sun because of something about the difference in length of day at different locations on Earth, the existence of the seasons, changing position of Sun in sky, etc. If you gave us some time, we could tell you specifically what it is
    C) we think the Earth goes around the Sun because of something about the difference in length of day at different locations on Earth, the existence of the seasons, changing position of Sun in sky, etc. We can't tell you the details.
    D) we think the Earth goes around the Sun because we can see reflex motion of the stars over the course of a year
    E) we're no longer sure that the Earth goes around the Sun

When called for, hold up the letter of your choice.