From the following listed projects, in which one can sloping be used for stabilising the excavation area?

Question

Answer

Trenches excavated in submerged sandy soil requiring the slope degree of 40˚ due to space limitation.

Answer

Natural soil beside the road in a mountainous region with the slope degree of 60˚.

Answer

Excavation of a water canal with the depth of 3m and side slope 40˚ in a clayey soil.

Answer

Excavation of multi-story basement used as underground carpark in a CBD area.

Crowdly