Consider how to complete this timeline to show the order in which different evolutionary ideas were developed. Choose from statements W, X, Y, and Z.

W – If left unchecked, a population will outgrow its food source.
X – Evolution is due to the inheritance of acquired traits.
Y – Natural selection leads to evolution.
Z – Humans and primates should be classified together.

Which labels, if placed from left to right, best complete the timeline?

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