Which statement is true of the undisturbed rock layers shown? limestone shale sandstone

The statement is true of the undisturbed rock layers shown is
Limestone is the youngest

Most of the rocks exposed at the surface of Earth area unit sedimentary--formed from particles of older rocks that are broken apart by water or wind. The gravel, sand, and dust settle to an all-time low in rivers, lakes, and oceans. These matter particles could bury living and dead animals and plants on the lake or Davy Jones's locker.

H=   2(area/a+b)h= 2(144/a+b)h= 2(144/18+18)h= 2(144/36)h= 2(4)h=8

Answer (true);