The correct answer is c) Structural safety.
Construction practices in hazard-prone areas need to focus on structural safety to ensure the safety of the people and property in the area. This means that buildings and other structures need to be built to withstand the forces of nature, such as earthquakes, hurricanes, and floods.
Option a) Aesthetics is not the most important factor in construction practices in hazard-prone areas. While it is important to build structures that are pleasing to the eye, this is not as important as ensuring the safety of the people and property in the area.
Option b) Cost-effectiveness is also not the most important factor in construction practices in hazard-prone areas. While it is important to build structures that are affordable, this is not as important as ensuring the safety of the people and property in the area.
Option d) Unregulated development is not a responsible way to build in hazard-prone areas. It is important to follow building codes and regulations to ensure the safety of the people and property in the area.
In conclusion, the correct answer is c) Structural safety. Construction practices in hazard-prone areas need to focus on structural safety to ensure the safety of the people and property in the area.