**Core Concept**
The patient's presentation suggests a bile leak, which is a common complication of laparoscopic cholecystectomy. Bile leaks can be managed with endoscopic or percutaneous drainage, with the choice of approach depending on the size and location of the leak.

**Why the Correct Answer is Right**
The patient's cystic duct leak is best managed with endoscopic retrograde cholangiopancreatography (ERCP) and stenting. ERCP allows for direct visualization of the bile ducts and the ability to place a stent to divert bile flow away from the leak site. This approach is particularly useful for leaks in the cystic duct or common bile duct. The 12 cm subhepatic collection on CT suggests a moderate-sized leak, which is amenable to endoscopic stenting.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is likely incorrect because percutaneous drainage alone may not be sufficient to manage a cystic duct leak, as it does not address the underlying cause of the leak.

**Option B:** This option is incorrect because surgical reexploration is typically reserved for cases where endoscopic or percutaneous management has failed, or in cases of severe bleeding or perforation.

**Option C:** This option is likely incorrect because antibiotics alone may not be sufficient to manage a bile leak, as the leak site remains a source of infection and bile leakage.

**Clinical Pearl / High-Yield Fact**
In cases of suspected bile leak after laparoscopic cholecystectomy, ERCP with stenting is the preferred initial management approach, as it allows for direct visualization and treatment of the leak site.

**Correct Answer:** C. Surgical reexploration