**Core Concept**
The cytochemistry of Acute Myeloid Leukemia (AML) involves the use of specific stains to identify and classify the cells. This includes various cytochemical reactions that help in differentiating AML from other types of leukemia. The most commonly used cytochemical stains in AML are peroxidase (myeloperoxidase), Sudan black B, and periodic acid-Schiff (PAS).

**Why the Correct Answer is Right**
The correct answer is related to the cytochemical characteristics of AML cells. AML cells typically exhibit myeloperoxidase positivity, which is a key feature in diagnosing myeloid lineage involvement. However, not all AML cases show PAS positivity, as this reaction is more commonly seen in acute lymphoblastic leukemia (ALL) and certain types of acute monocytic leukemia. The other options, myeloperoxidase and Sudan black B, are indeed characteristic of AML.

**Why Each Wrong Option is Incorrect**
**Option A:** This option may be a distractor, but without the actual text, we cannot assess its validity.
**Option B:** This option may also be a distractor, but without the actual text, we cannot assess its validity.
**Option C:** This option may also be a distractor, but without the actual text, we cannot assess its validity.

**Clinical Pearl / High-Yield Fact**
It is essential to remember that AML cells often exhibit a heterogeneous pattern of cytochemical staining, and not all cells may react positively to all stains. Therefore, a combination of cytochemical reactions and immunophenotyping is crucial for accurate diagnosis.

**Correct Answer:** D.