**Core Concept**
Basophilic stippling is a morphological feature observed in red blood cells (RBCs) characterized by the presence of small, darkly staining inclusions. These inclusions are typically composed of ribonucleic acid (RNA) or denatured RNA, which accumulate within the RBCs due to various enzymatic deficiencies.

**Why the Correct Answer is Right**
5' nucleotidase deficiency is a rare inherited disorder that leads to the accumulation of ribonucleotides within RBCs. Normally, 5' nucleotidase is responsible for the conversion of nucleotides to nucleosides in the RBCs. However, in cases of 5' nucleotidase deficiency, this conversion is impaired, resulting in the accumulation of ribonucleotides, which appear as basophilic stippling under a microscope. This condition is associated with hemolytic anemia and is often diagnosed through the examination of RBC morphology.

**Why Each Wrong Option is Incorrect**
**Option A:** Ala synthetase deficiency is associated with a different disorder, known as porphyria, which affects the production of heme. While porphyria can lead to various hematological abnormalities, it is not directly related to basophilic stippling.
**Option B:** Ferrochelatase deficiency is also associated with porphyria and affects the final step in heme biosynthesis. Like Ala synthetase deficiency, it is not directly related to basophilic stippling.
**Option D:** Ala dehydrogenase deficiency is a rare enzyme deficiency that affects the metabolism of amino acids. While it can lead to various metabolic disorders, it is not directly related to basophilic stippling.

**Clinical Pearl / High-Yield Fact**
Basophilic stippling can also be seen in other conditions, such as lead poisoning, which inhibits the enzyme 5' nucleotidase, leading to a similar accumulation of ribonucleotides within RBCs.

**✓ Correct Answer: C. 5' nucleotidase deficiency**