The table below shows the height of some horse fossils.

Horse Fossil RecordHorse Fossil Height (cm)
W 52
X 135
Y 38
Z 100

Ancient horses were much smaller than present-day horses. The present-day horse is 140 centimeters tall. What is the correct order of evolution of the horse starting from the oldest fossil?

X Z W Y
Y W Z X
W Y X Z
Z X W Y