**Core Concept**
Effective renal blood flow (ERBF) is the amount of blood that reaches the kidneys to perform their functions, including filtration, secretion, and reabsorption. In humans, ERBF is approximately 1.2 liters per minute (L/min), which accounts for about 20-25% of the cardiac output.

**Why the Correct Answer is Right**
The kidneys receive their blood supply from the renal arteries, which branch off from the aorta. The renal arteries then divide into smaller arterioles that lead to the glomeruli, where filtration occurs. The glomeruli are specialized capillary clusters that allow for the selective passage of water, ions, and small molecules into the renal tubules. The ERBF is crucial for maintaining proper renal function and is influenced by factors such as blood pressure, cardiac output, and renal vascular resistance.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as it does not accurately represent the ERBF. The ERBF is not directly related to the cardiac output, although it is influenced by it.
**Option B:** This option is incorrect as it does not accurately represent the ERBF. The ERBF is not directly related to the glomerular filtration rate (GFR), although they are both important aspects of renal function.
**Option C:** This option is incorrect as it does not accurately represent the ERBF. The ERBF is not directly related to the renal plasma flow (RPF), although they are both important aspects of renal function.

**Clinical Pearl / High-Yield Fact**
It's essential to note that the ERBF can be affected by various factors, including hypertension, heart failure, and renal artery stenosis. Maintaining adequate renal blood flow is crucial for preventing acute kidney injury (AKI) and preserving renal function.

**Correct Answer: C. 1.2 liters per minute**