Place These Steps of Enzyme Catalysis in the Correct Order

Place these steps of enzyme catalysis in the correct order: 1. The substrate and enzyme change shape.
2) The substrate enters the active site.
3) The enzyme reverts to its original configuration.
4) The product is expelled.

A) 1, 2, 3, 4
B) 1, 3, 4, 2
C) 2, 1, 4, 3
D) 2, 1, 3, 4
E) 2, 3, 1, 4