**Core Concept**
Iron transport in the body is crucial for various cellular processes, including oxygen transport, DNA synthesis, and enzyme function. The transport form of iron is significant for its bioavailability and utilization by different tissues. **Ferrous iron (Fe2+) and ferric iron (Fe3+) are the two primary forms of iron in the body.**

**Why the Correct Answer is Right**
The correct transport form of iron is **ferric iron (Fe3+),** which is bound to transferrin, a glycoprotein in the blood plasma. This complex is essential for the transport of iron from the intestine to the liver, spleen, and bone marrow. Ferric iron is then reduced to ferrous iron, which is taken up by cells for various cellular processes. The **transferrin receptor** plays a crucial role in the uptake of transferrin-bound iron by cells.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as it does not accurately describe the primary transport form of iron in the body.
**Option B:** This option is incorrect as it is not a well-known transport form of iron.
**Option C:** This option is incorrect as it is not the primary transport form of iron.

**Clinical Pearl / High-Yield Fact**
Iron is an essential nutrient, and its transport form is crucial for various cellular processes. **Ferric iron (Fe3+) is the primary transport form of iron, bound to transferrin, which is essential for its transport and utilization by different tissues.**

**Correct Answer:** C. Ferric iron.