Which of the following is a common reason for using a Time and Materials contract?

Using a Time and Materials contract is often associated with varying project requirements because this type of contract provides the flexibility to accommodate changes and uncertainties throughout the project's lifespan. When project requirements are not clearly defined or are likely to evolve, a Time and Materials contract allows the client to pay for the actual labor and materials used rather than committing to a fixed price based on an uncertain scope of work.

This approach is particularly beneficial in situations where the scope may change frequently, enabling project managers to respond quickly to new developments or client needs without the constraints imposed by fixed-price contracts. This adaptability helps ensure that the project can adjust to various challenges as they arise while maintaining progress and control over costs.