Which one of the following is formed when volcanic ash is carried by running water and is deposited as a sedimentary layer?

Tuff is the rock formed when volcanic ash is carried by running water and deposited as a sedimentary layer that subsequently consolidates. It is a type of pyroclastic rock made up of compacted volcanic ash. Basalt is an igneous rock formed from rapidly cooled lava. Lapilli refers to small stone-sized fragments (2-64 mm) ejected during volcanic eruptions but is not specifically water-deposited. Slate is a metamorphic rock formed from shale under heat and pressure. Tuff specifically refers to consolidated volcanic ash deposits, and when water transport and sedimentation are involved, it is sometimes called water-laid or reworked tuff.