**Core Concept:**
The question asks about the most common mode of inheritance for congenital hereditary disorders. Inheritance refers to how a genetic trait is passed down from parents to offspring. There are three main types:

1. **Autosomal Recessive:** The affected individual must inherit two copies of the abnormal gene (one from each parent) for the disorder to manifest.
2. **Autosomal Dominant:** The affected individual only needs to inherit one abnormal gene from a parent to develop the disorder.
3. **X-linked Dominant:** The disorder affects males more frequently because they have only one X chromosome.

**Why the Correct Answer is Right:**
The correct answer, option C (X-linked Dominant), is due to the following reasons:

- X-linked Dominant disorders affect males more frequently because they have only one X chromosome. In females (XX), an affected mother can pass on the abnormal gene to her daughter but not her son.
- In X-linked Dominant inheritance, affected females may have milder symptoms or be completely asymptomatic (carriers).

**Why Each Wrong Option is Incorrect:**

A. Autosomal Recessive disorders (option A) can manifest in both males and females, as both have two copies of the autosomes.
B. Autosomal Dominant disorders (option B) can affect both males and females equally, as both have two copies of autosomes.
D. Mitochondrial disorders (option D) involve genetic material found in mitochondria and are not related to the type of inheritance mentioned in the question.

**Clinical Pearl:**
Understanding the mode of inheritance helps predict the likelihood of inheritance in family members and provides insight into the sex-linked nature of some disorders. It is essential knowledge for genetic counseling and disease management.

**Correct Answer:** X-linked Dominant (C)