Which 1, 2, 3 or 4?

Which 1, 2, 3 or 4? picture 1 of 4
Which 1, 2, 3 or 4? picture 2 of 4
Which 1, 2, 3 or 4? picture 3 of 4
Which 1, 2, 3 or 4? picture 4 of 4