Which of the following is included in the factors necessitating special inspections?

The correct option points to the inclusion of alternative materials or different requirements as a factor necessitating special inspections. Special inspections are typically required for construction practices that deviate from the normal or standard practices. This is particularly relevant when alternative materials are used that might not have the same level of proven performance as standard materials or when the design incorporates nontraditional methodologies that could impact safety and structural integrity.

In cases where builders select alternative materials or designs that deviate from established norms, special inspections ensure that these elements are being implemented according to code requirements and project specifications. These inspections are critical to verifying compliance with safety standards and ensuring that the architectural intentions translate into safe, durable constructions.

The aspect of standard materials and unusual designs does not fully encompass the range necessitating special inspections, as these scenarios could either involve normal inspections or be covered under routine evaluations. Hence, the choice highlighting alternative materials or differing requirements is the most comprehensive in understanding factors that trigger the need for special scrutiny in building projects.