Final answer:
The contractor is generally responsible for estimating and pricing temporary structures for construction projects, as they manage project execution and related costs.
Step-by-step explanation:
The party normally responsible for estimating and pricing the temporary structures required for a construction project is typically C. Contractor. The contractor's role involves handling the overall execution of the project, which includes estimating costs associated with labor, materials, and equipment. Temporary structures could include scaffolding, site fencing, trailers, and other temporary facilities necessary for the construction phase. These structures are essentials for site operation, and their costs are usually incorporated into the bid the contractor submits to the owner. As a part of the bid process, contractors use their expertise to efficiently price these temporary items to ensure the project stays within budget.