The correct answer is: C. different shear strengths of small magnitude.
The liquid limit is the water content at which a soil will flow like a liquid. At this point, the soil has lost its strength and can be easily deformed. The shear strength of a soil is its ability to resist deformation. The shear strength of a soil is affected by its water content, among other factors. As the water content of a soil increases, its shear strength decreases. This is because the water molecules lubricate the soil particles, making it easier for them to slide past each other.
At the liquid limit, all soils have different shear strengths. This is because the soil particles in different soils have different shapes and sizes. The shape and size of the soil particles affect the way that the water molecules interact with them. This, in turn, affects the shear strength of the soil.
The shear strength of a soil is an important factor in determining its engineering properties. For example, the shear strength of a soil is used to design foundations for buildings and other structures.