The diagram below represents the rock cycle. The diagram shows 3 rectangular boxes labeled Igneous rock, metamorphic rock, and sedimentary rock and 2 ovals labeled Magma and Sediment. There are 9 arrows. One arrow points from igneous rock to magma, one arrow points from igneous rock to metamorphic rock, one arrow points from igneous rock to sediment, one arrow points from magma to igneous rock, one arrow points from metamorphic rock to magma, one arrow points from metamorphic rock to sediment, one arrow points from sedimentary rock to metamorphic rock, one arrow points from sedimentary rock to sediment, and one rock points from sediment to sedimentary rock and is labeled A.

Which process is represented by the label A?

Compaction and cementation
Deposition and transportation
Heat and pressure
Weathering and erosion