The correct answer is: A. when and how much?
Detailed project control is a process that helps to ensure that a project is completed on time, within budget, and to the required quality standards. It does this by tracking the progress of the project and comparing it to the project plan. If there are any variances, detailed project control can help to identify the causes of the variances and take corrective action to get the project back on track.
Detailed project control answers the questions of when and how much by tracking the progress of the project against the project plan. This information can be used to identify any variances and take corrective action to get the project back on track.
The other options are incorrect because they do not accurately reflect the purpose of detailed project control. Option B, who and why, is incorrect because detailed project control does not track who is responsible for completing tasks or why tasks are being completed. Option C, when and where, is incorrect because detailed project control does not track the location of tasks or when tasks are being completed. Option D, who and when, is incorrect because detailed project control does not track who is responsible for completing tasks or when tasks are being completed.