Final answer:
The most important characteristics of a qualified contractor are: basic engineering skills, sound financial basis, skilled supervision, and qualified labor.
Step-by-step explanation:
The most important characteristics of a qualified contractor would include access to basic engineering skills, a sound financial basis, skilled supervision, and qualified labor. This aligns with option (c) I., III., IV., and V from the list provided. In this context, engineering skills can range from technical abilities such as the application of math and science principles, to soft skills like communication.
Contractors need to organize blueprints, adhere to building codes, and operate complex tools, which requires both mental and physical labor. Additionally, a stable financial background is key to managing projects and ensuring resources are available. Skilled supervision is necessary for leading projects effectively, and qualified labor ensures that the tasks are executed to high standards.
Respect and good training are also important for employees, but the question specifically asked for the most important characteristics for a contractor, hence the selection of sound financials, skills, supervision, and labor over other qualities.