Arrange the layers and the fault line from youngest to oldest.

A, F, B, C, D, E

Explanation:
The layers can only be cracked if they are already there, making A the youngest. From there, F is next because it has cracked B - E meaning they existed before the crack. After that, the order goes from top to bottom since a later can not sit on top of another layer unless a more drastic shifting of the layers occurred. Hope this helped!