**Core Concept**
The response to iron deficiency anemia is characterized by the body's attempt to compensate for the lack of iron, leading to a series of physiological changes. This involves the production of erythropoietin, an increase in red blood cell production, and changes in the body's iron metabolism.

**Why the Correct Answer is Right**
The correct response to iron deficiency anemia involves the production of erythropoietin, which stimulates the bone marrow to produce more red blood cells. This is achieved through the action of erythropoietin receptors on erythroid progenitor cells, leading to an increase in red blood cell production. Additionally, the body increases the absorption of iron from the gut, which is mediated by the hormone hepcidin. Hepcidin regulates iron metabolism by controlling the absorption of iron from the gut and its release from stores.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately describe the body's response to iron deficiency anemia.
**Option B:** This option is incorrect because it is not a direct response to iron deficiency anemia.
**Option C:** This option is incorrect because it is a potential cause of iron deficiency anemia, rather than a response to it.

**Clinical Pearl / High-Yield Fact**
The body's response to iron deficiency anemia involves a complex interplay between erythropoietin, hepcidin, and iron metabolism. Understanding these mechanisms is crucial for diagnosing and managing iron deficiency anemia.

**Correct Answer:** C. Increased absorption of iron from the gut.