Final answer:
The three primary variables in project management are time, cost, and scope, which constitute the Project Management Triangle or Iron Triangle. Option c (time, cost, scope) is the correct answer to the multiple-choice question, as these are the critical factors influencing project success and management.
Step-by-step explanation:
The three primary variables (or triple constraints) in any project are time, cost, and scope. These factors are critical for project success and management. The time constraint involves the project’s schedule and deadlines. The cost constraint refers to the budget and financial resources available for the project. Lastly, the scope entails the goals, deliverables, and work required to complete the project. Together, these constraints form a triangle where if one side is altered, the other two sides or variables are likely to be impacted, thus they must be managed carefully.
In project management, these constraints are also interrelated; changing one can affect the others. For instance, if the scope of the project expands, it may take more time and require more cost to complete. Similarly, reducing the budget might mean less scope can be achieved, or it might take longer to find cost-effective solutions. Project managers need to balance these constraints to deliver successful projects.
To answer the multiple-choice question, the correct option is c. time, cost, and scope. This trio is often referred to as the Project Management Triangle or Iron Triangle in the field of project management.