Cantilever retaining walls can safely be used for a height not more than A. 3 m B. 4 m C. 5 m D. 6 m

The correct answer is: C. 5 m.

Cantilever retaining walls are a type of retaining wall that is supported by its own weight and the weight of the soil it retains. They are typically used for low retaining walls, up to 5 m in height.

The maximum height of a cantilever retaining wall is limited by the following factors:

• The strength of the soil: The soil must be strong enough to support the weight of the wall and the soil it retains.
• The type of soil: The type of soil will affect the stability of the wall. For example, clay soils are more stable than sandy soils.
• The groundwater table: The groundwater table must be below the base of the wall to prevent the wall from becoming unstable.
• The seismic activity: The seismic activity in the area will
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