Because this project needs the specific resource of Henry, the application developer, and Henry is not available, it is considered as a resource constraint. Recall that a constraint is anything that limits the project manager's option.

Answer option C is incorrect. A resource requirement is simply the need for an application developer.

Answer option B is incorrect. This is likely a matrix organization, but it is not the best answer for this question.

Answer option A is incorrect. While there may be some competition for skilled resources, such as Henry, the application developer, it is not the best answer for this question.