**Core Concept**
Leukoreduction is a process that reduces the number of white blood cells (WBCs) in blood products, aiming to minimize the risk of transfusion-related complications. This process is crucial in preventing the transmission of certain viruses and reducing the incidence of graft-versus-host disease. The reduction of WBCs is typically achieved through filtration.

**Why the Correct Answer is Right**
The correct answer is related to the effectiveness of leukoreduction in reducing WBCs. Leukoreduction typically reduces the WBC count by 3 logs, or 1,000-fold, which significantly decreases the risk of adverse reactions. This process involves the use of specific filters that can remove a high percentage of WBCs from the blood product.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it underestimates the effectiveness of leukoreduction.
**Option B:** This option is also incorrect as it does not accurately reflect the standard reduction achieved by leukoreduction.
**Option D:** This option overestimates the reduction, as the typical reduction is not as high as this option suggests.

**Clinical Pearl / High-Yield Fact**
Leukoreduction is a critical step in the preparation of blood products for transfusion, significantly reducing the risk of complications such as febrile non-hemolytic transfusion reactions and transfusion-related immune suppression. Remembering that leukoreduction reduces WBCs by 3 logs is key for understanding its benefits and applications.

**Correct Answer:** C. 1000-fold reduction