**Core Concept**
Anemic hypoxia occurs when the body's tissues do not receive sufficient oxygen due to a decrease in the number or function of red blood cells, leading to inadequate oxygen delivery to the tissues. This type of hypoxia is characterized by a decrease in the oxygen-carrying capacity of the blood.

**Why the Correct Answer is Right**
Anemic hypoxia is caused by a reduction in the amount of hemoglobin or red blood cells, leading to decreased oxygen delivery to the tissues. This can result from various factors, including iron deficiency anemia, vitamin B12 or folate deficiency, or hemolysis. The body responds to anemic hypoxia by increasing ventilation and cardiac output to compensate for the decreased oxygen delivery.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is not relevant to anemic hypoxia, as it does not describe a condition related to oxygen delivery or red blood cell function.

**Option B:** This option is incorrect because anemic hypoxia is not caused by a decrease in the partial pressure of oxygen in the arterial blood. Instead, it is caused by a decrease in the oxygen-carrying capacity of the blood.

**Option C:** This option is not directly related to anemic hypoxia, as it describes a different type of hypoxia that occurs due to a decrease in the partial pressure of oxygen in the arterial blood.

**Clinical Pearl / High-Yield Fact**
It is essential to differentiate between anemic hypoxia and hypoxic hypoxia (or hypoxemic hypoxia), as the two conditions require different treatment approaches. Anemic hypoxia requires treatment of the underlying cause, such as iron supplementation or blood transfusion, whereas hypoxic hypoxia requires treatment of the underlying cause of the low oxygen levels, such as oxygen therapy.

**Correct Answer:** D.