In the hilly regions of Manipur, the soils are predominantly classified as:

Loamy soils
Clayey soils
Sandy soils
Silty soils

The correct answer is: Loamy soils.

Loamy soils are a mixture of sand, silt, and clay. They are well-drained and have good water retention capacity. Loamy soils are the most fertile type of soil and are suitable for a variety of crops.

Clayey soils are composed of very fine particles that pack tightly together. They are slow to drain and have poor water retention capacity. Clayey soils are often difficult to work with and can be prone to erosion.

Sandy soils are composed of large particles that do not pack together tightly. They are well-drained but have poor water retention capacity. Sandy soils are often low in nutrients and can be difficult to grow crops in.

Silty soils are composed of particles that are intermediate in size between sand and clay. They have good drainage and water retention capacity. Silty soils are often fertile and suitable for a variety of crops.

In the hilly regions of Manipur, the soils are predominantly classified as loamy soils. This is because the hilly regions are characterized by a mixture of sand, silt, and clay. The loamy soils in the hilly regions of Manipur are well-drained and have good water retention capacity. They are also fertile and suitable for a variety of crops.