Correct Answer - Option 3 : You will verify whether the suspicion is valid
Dismissing a person immediately based on suspicion is a wrong decision made in haste and is the completely wrong course of action.
Stopping the man's intended promotion is again a wrong decision made in haste and is a completely wrong course of action.
Suspicion should be verified for its validity. Clearly, 'You will verify whether the suspicion is valid' is the correct course of action.
Suspending him immediately is again a wrong decision made in haste and is the completely wrong course of action.
Hence, 'You will verify whether the suspicion is valid' is the correct answer.