Final answer:
If the patient presents in acute respiratory distress and the trach tube is clear, the next step is to troubleshoot the ventilator. If unable to troubleshoot, manual ventilation using a bag-valve device may be necessary. The correct option is A.
Step-by-step explanation:
If a patient with a tracheostomy and on a ventilator presents in acute respiratory distress, the first step is to ensure the trach tube is clear, which you have already done. Since you have ruled out any issues with the trach tube, the next step would be to troubleshoot the ventilator.
Check the settings and connections on the ventilator to ensure it is functioning properly.
If you are unable to troubleshoot the ventilator or find any issues, then you would need to take manual control of the patient's ventilation by disconnecting them from the ventilator and using a bag-valve device to manually ventilate the patient. Option A. is the correct one.