**Core Concept**
Autoimmune hepatitis (AIH) is a chronic inflammatory liver disease characterized by the presence of autoantibodies and interface hepatitis on liver biopsy, often accompanied by minimal portal fibrosis.

**Why the Correct Answer is Right**
The patient's laboratory results and liver biopsy findings are consistent with AIH. The presence of positive ANA, anti-liver kidney microsome-1, and anti-smooth muscle antibodies supports an autoimmune etiology. Interface hepatitis, characterized by a mononuclear cell infiltrate at the border between the liver lobules and the portal tracts, is a hallmark of AIH. The mild portal fibrosis seen on liver biopsy is also consistent with the chronic nature of AIH.

**Why Each Wrong Option is Incorrect**
* **Option A:** Primary biliary cholangitis (PBC) is characterized by the presence of anti-mitochondrial antibodies and progressive cholestasis, which are not seen in this patient.
* **Option B:** Primary sclerosing cholangitis (PSC) is associated with inflammatory bowel disease and features of biliary obstruction, which are not present in this case.
* **Option D:** Wilson's disease is a genetic disorder that presents with elevated copper levels and Kayser-Fleischer rings, which are not mentioned in the patient's history.

**Clinical Pearl / High-Yield Fact**
Autoimmune hepatitis can be challenging to diagnose, and a high index of suspicion is necessary. The presence of interface hepatitis on liver biopsy and autoantibodies, particularly anti-smooth muscle antibodies, are key features that support the diagnosis.

**Correct Answer:** C.