Stability of an existing structure may be disturbed by A. Rising of water table B. Vibrations caused by traffic movements C. Mining in the neighborhood D. All the above

The correct answer is D. All the above.

Rising of water table can cause the soil to become saturated and lose its strength. This can lead to the foundation of a structure becoming unstable and sinking. Vibrations caused by traffic movements can also cause the foundation of a structure to become unstable. Mining in the neighborhood can cause the ground to subside, which can also lead to the foundation of a structure becoming unstable.

Here are some additional details about each of the options:

• Rising of water table: The water table is the level at which the ground is saturated with water. When the water table rises, it can cause the soil to become saturated and lose its strength. This can lead to the foundation of a structure becoming unstable and sinking.
• Vibrations caused by traffic movements: Traffic movements can cause the ground to vibrate. This vibration can cause the foundation of a structure to become unstable.
• Mining in the neighborhood: Mining can cause the ground to subside. This subsidence can lead to the foundation of a structure becoming unstable.