In 1878, Eadweard Muybridge Photographed a Galloping Horse and Discovered

In 1878, Eadweard Muybridge photographed a galloping horse and discovered that:

A) racing horses keep at least one hoof on the ground at all times.
B) galloping horses occasionally have all four hooves off the ground.
C) racing horses resemble hobby-horses with legs stretched forward and backward.
D) off-track betting is an easy way to make a living.
E) light-sensitive materials of that day could not stop action.