Which tillage practice involves forming ridges and furrows?

Bedding is the correct choice because it specifically refers to the agricultural practice of forming ridges (beds) and furrows in the soil. This technique is widely used to improve water drainage, promote aeration, and facilitate the management of soil for cultivating crops. The raised beds can help reduce soil compaction, enhance root growth, and improve crop yield by allowing better access to nutrients and moisture.

In contrast, tilling typically refers to the general process of preparing the soil for planting, which may not necessarily involve creating distinct ridges and furrows. Plowing is a broader term that involves turning over the soil to prepare for planting but is not limited to forming beds. Subsoiling is a specific tillage process aimed at loosening soil far below the surface layer but does not create the raised structures characteristic of bedding. Hence, bedding is uniquely defined by its ridge and furrow formation, making it the right answer.