**Core Concept**
Osteogenesis imperfecta is a genetic disorder characterized by brittle bones, caused by mutations in the genes encoding for type I collagen. The condition is inherited in an autosomal dominant pattern, but the parents are normal because they are heterozygous carriers of the mutated gene.

**Why the Correct Answer is Right**
The correct answer is an example of "anticipation" in genetics, where the severity of the disease increases with each subsequent generation. This occurs because the affected individuals in the previous generation may have been heterozygous carriers, and their offspring may inherit two copies of the mutated gene, leading to more severe symptoms. The parents in this case are heterozygous carriers, which means they have one normal and one mutated copy of the gene. They do not express the disease because the normal copy of the gene is dominant, but they can pass on the mutated copy to their offspring.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it suggests a different mode of inheritance, such as autosomal recessive, which would require both parents to be carriers of the mutated gene to produce affected offspring.
**Option B:** This option is incorrect because it implies that the parents are homozygous recessive for the mutated gene, which would be consistent with an autosomal recessive pattern of inheritance.
**Option C:** This option is incorrect because it suggests a sex-linked pattern of inheritance, which would require the mutated gene to be located on the X chromosome.

**Clinical Pearl / High-Yield Fact**
The concept of anticipation in genetics is important for medical professionals to understand, as it can lead to increased severity of symptoms in subsequent generations. This is particularly relevant for genetic disorders with autosomal dominant inheritance patterns.

**Correct Answer: C. Autosomal Dominant Inheritance.**