**Core Concept**
The patient's condition is a classic presentation of urethral injury, specifically a prostatomembranous urethral disruption, which is a serious and potentially life-threatening condition that requires immediate attention. This type of injury often occurs in the setting of pelvic trauma, such as a pelvic fracture, and is associated with significant bleeding and urinary retention.

**Why the Correct Answer is Right**
In the case of a prostatomembranous urethral disruption, the most appropriate immediate treatment is **urgent catheterization under fluoroscopic guidance**. This approach allows for the identification of the urethral injury and the placement of a catheter to divert urine and reduce the risk of further bleeding. The use of fluoroscopy enables the visualization of the urethra and helps to avoid further trauma to the injured area.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because immediate surgical repair of the urethral injury is not typically the first step in management. While surgery may be necessary in some cases, it is usually reserved for patients who are hemodynamically unstable or who have significant bleeding that cannot be controlled with catheterization.

**Option B:** This option is incorrect because the use of a Foley catheter without fluoroscopic guidance can cause further trauma to the injured urethra, leading to worsening bleeding and potential complications.

**Option C:** This option is incorrect because the use of a suprapubic catheter may not provide adequate drainage of the bladder, particularly in the setting of a prostatomembranous urethral disruption, where the bladder outlet is compromised.

**Clinical Pearl / High-Yield Fact**
In cases of urethral injury, it is essential to remember the "ABCDE" approach to management: **A**void further trauma, **B**leeding control, **C**atheterization under fluoroscopic guidance, **D**rainage of the bladder, and **E**valuation of the extent of injury.

**Correct Answer: C. Catheterization under fluoroscopic guidance.**