The correct answer is C) Feedback controls. Feedback controls measure actions or activities that have already occurred and implement corrective action if needed. They provide information about past performance, allowing managers to assess whether goals were met and make adjustments as necessary. This type of control is implemented after the fact, unlike feedforward controls which aim to prevent problems before they occur. The other answer choices are incorrect because: A) Concurrent controls monitor activities as they happen, B) Feedforward controls focus on preventing future problems, and D) Screening controls are used to select qualified personnel, not measure past performance.