I believe the correct answer would be P waves, S waves, L waves. P waves are the first to arrive at a seismic section. S waves move quickly, but not as quick as the P waves, and the L waves are the slowest out of all of them. Hope this helped!
The speed at which seismic waves travel depends on the properties of the material that they are passing through. For example, the denser a material is, the faster a seismic wave travels. P waves can travel through liquid and solids and gases, while S waves only travel through solids.
