**Core Concept**
The primary complex in congenital tuberculosis refers to the initial site of infection where the tuberculosis bacteria first establish themselves in the fetus. This can occur through various routes, but in the context of congenital tuberculosis, it's crucial to understand the **placental transmission** of **Mycobacterium tuberculosis**.

**Why the Correct Answer is Right**
Since the question is incomplete and doesn't specify the options, we'll focus on the general principle of congenital tuberculosis. The primary complex in the liver in congenital tuberculosis occurs due to the **hematogenous spread** of the bacteria from the placenta to the fetus. This happens when the bacteria infect the placenta and then are transported to the fetus through the bloodstream, potentially seeding in various organs including the liver.

**Why Each Wrong Option is Incorrect**
**Option A:** Without the specific details of the options, we can't directly address why each is incorrect. However, generally, any option that does not involve the hematogenous spread or direct infection from the placenta would be incorrect.
**Option B:** Similarly, without specifics, we can say that if an option suggests a route that doesn't involve the placenta or bloodstream, it would be incorrect.
**Option C:** and **Option D:** would be incorrect based on similar reasoning, focusing on the incorrect pathway of infection.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that congenital tuberculosis is rare but can occur through the **placenta** from an infected mother to the fetus. Understanding the **hematogenous spread** of infection is crucial for diagnosing and managing congenital tuberculosis.

**Correct Answer:** Unfortunately, without the provided options, the correct answer cannot be specified.