Choice A rationale:

Administering antibiotics may be necessary in some cases of acute urinary retention if there is an underlying infection, but the immediate priority is to relieve the obstruction causing the retention.

Antibiotics alone will not relieve the obstruction.

Choice B rationale:

Surgery may be considered as a treatment option for BPH, but it is not the immediate priority when a client is experiencing acute urinary retention.

The obstruction needs to be relieved promptly to prevent complications.

Choice C rationale:

Inserting a urinary catheter is the nurse's priority intervention in a client with acute urinary retention due to BPH.

This procedure helps drain the urine from the bladder and provides immediate relief from the obstruction.

Choice D rationale:

Recommending lifestyle modifications is important for managing BPH in the long term, but it is not the immediate priority when a client is experiencing acute urinary retention.

The client first needs urgent intervention to address the retention.