Correct Answer: D
In project management, a risk is an uncertain event or condition that, if it occurs, has a positive or negative effect on a project's objectives. The items listed in the options can all be considered risks: A. Workers in a union with a right to strike can lead to labor disruptions. B. A business located in a hurricane zone may face operational shutdowns due to weather events. C. A computer system with poor security is susceptible to data breaches or cyber-attacks. Each of these can adversely affect the project's scope, time, cost, and quality, and therefore, they are identified as risks.
References: The explanation is based on the principles of risk management as outlined in the Professional in Project Management (PPM) and PMBOK guides, which define risks and the process of identifying risks within project management12.