**Core Concept**
Autosomal recessive disorders are genetic conditions caused by mutations in genes located on non-sex chromosomes (22 out of the 23 pairs). These conditions manifest when an individual inherits two copies of the mutated gene, one from each parent, and are typically characterized by decreased or absent enzyme activity.

**Why the Correct Answer is Right**
Autosomal recessive disorders often affect the function of specific enzymes or proteins, leading to accumulation of toxic substances or deficiency of essential compounds. For example, Tay-Sachs disease is caused by a deficiency of the enzyme hexosaminidase A, leading to accumulation of GM2 gangliosides in neurons.

**Why Each Wrong Option is Incorrect**
**Option A:** Not specified, but generally, this option should be an autosomal recessive disorder like cystic fibrosis, sickle cell anemia, or phenylketonuria (PKU).
**Option B:** Not specified, but this option should be an autosomal dominant disorder like Huntington's disease, neurofibromatosis, or Marfan syndrome.
**Option C:** Not specified, but this option should be an X-linked recessive disorder like hemophilia A or B, or Duchenne muscular dystrophy.

**Clinical Pearl / High-Yield Fact**
When diagnosing genetic disorders, it's essential to consider the inheritance pattern, family history, and clinical presentation. Autosomal recessive disorders often present with severe symptoms in the first few years of life, whereas autosomal dominant disorders may have a later onset.

**Correct Answer: D.**