**Core Concept**
Homozygous sickle cell anemia is a genetic disorder characterized by the presence of **hemoglobin S (HbS)**, which results from a mutation in the **HBB** gene encoding the beta-globin subunit of hemoglobin. This leads to abnormal hemoglobin polymerization under low oxygen conditions. Hemoglobin electrophoresis is a diagnostic tool used to separate and identify different hemoglobin variants based on their charge.

**Why the Correct Answer is Right**
In homozygous sickle cell anemia, hemoglobin electrophoresis typically shows a predominance of **HbS**, with minimal or no detectable **hemoglobin A (HbA)**, which is the normal adult hemoglobin. Since the question is incomplete regarding the options provided, the general principle is that any option representing a normal or non-sickle cell hemoglobin variant (like HbA) would not be seen or would be significantly reduced in homozygous sickle cell anemia.

**Why Each Wrong Option is Incorrect**
**Option A:** Without the specific option details, we cannot directly address why each is incorrect, but generally, any option that represents a hemoglobin variant that could coexist with HbS in sickle cell anemia (like **HbF** or **HbA2**) or is a known component of the disease (like **HbS** itself) would not be the correct answer.
**Option B:** Similarly, without specifics, if this option represented a possible finding in sickle cell anemia, it would not be correct.
**Option C:** This could potentially be a distractor representing another abnormal hemoglobin that might be seen in compound heterozygous states but not typically in homozygous sickle cell disease.
**Option D:** If this option represented **HbA**, it would be the correct answer because HbA is significantly reduced or absent in homozygous sickle cell anemia.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that individuals with homozygous sickle cell anemia have predominantly **HbS**, with little to no **HbA**. The presence of **HbF** can vary and may influence the severity of the disease.

**Correct Answer:** D. HbA