Which of the Following Is True of Eolian Ripples

Which of the following is true of eolian ripples?

A) they are generally positioned parallel with the direction of the effective wind.
B) their spacing is controlled by the moisture content of the sand.
C) they are oriented transversely,or at right angles,to the direction of the wind.
D) they form reg deserts made up of lag gravels.
E) exact wind speed can be calculated from their spacing.