The principle of original horizontality is the most select one:

a. biased method to date rocks.
b. complicated method to date rocks.
c. biased explanation for why sediments form layers.
d. creative explanation for why sediments form layers.

The correct choice is C. It is a biased explanation of why sediments form layers and how layer formation occurs, this is based on the theory that sediments are deposited horizontally and are flat, and when they have not been Altered remain the same, this definition depends on the stratigraphy theory that defines the behavior of the rocks and how the layers are formed.