The most suitable method for drainage of fine grained cohesive soils is A. well ppint system B. vacuum method C. deep well system D. electroosmosis method

The correct answer is: A. well point system.

A well point system is a drainage system that uses well points to remove water from the ground. Well points are small, perforated pipes that are installed in the ground and connected to a vacuum pump. The vacuum pump creates a suction that draws water out of the well points and into a collection tank.

Well point systems are often used to drain fine-grained cohesive soils because they are effective in removing water from these types of soils. Well point systems are also relatively inexpensive to install and operate.

The other options are not as suitable for drainage of fine-grained cohesive soils.

• Option B, vacuum method, is a drainage method that uses a vacuum to remove water from the ground. This method is not as effective for fine-grained cohesive soils because these soils are not as easily penetrated by the vacuum.
• Option C, deep well system, is a drainage method that uses deep wells to remove water from the ground. This method is not as suitable for fine-grained cohesive soils because these soils are not as easily penetrated by the wells.
• Option D, electroosmosis method, is a drainage method that uses an electric current to remove water from the ground. This method is not as effective for fine-grained cohesive soils because these soils are not as easily penetrated by the electric current.