Final answer:
Researching site zoning regulations would be the likely initial step in determining the feasibility of a residential/commercial project.
Step-by-step explanation:
The likely initial step in determining the feasibility of a residential/commercial project would be d- researching site zoning regulations. Zoning regulations are put in place by governments to regulate the use of land and determine what types of businesses and properties are allowed in certain areas. By researching the site zoning regulations, the developer can determine if their project aligns with the zoning requirements and if it is feasible to proceed with their plans.