**Core Concept**
The question is testing the knowledge of the genetic basis of Wilms tumor, a type of childhood kidney cancer. Wilms tumor is associated with mutations in the WT1 gene, which plays a crucial role in the development and growth of the kidneys.

**Why the Correct Answer is Right**
The WT1 gene is a tumor suppressor gene that helps regulate cell growth and division in the developing kidneys. Mutations in the WT1 gene can lead to the development of Wilms tumor. The WT1 gene is located on the short arm of chromosome 11 (11p13). The correct answer is related to the chromosomal location of the WT1 gene.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not specify the correct chromosomal location of the WT1 gene.
**Option B:** This option is incorrect because it is not a recognized location for the WT1 gene.
**Option C:** This option is incorrect because it is not the correct chromosomal location of the WT1 gene.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that Wilms tumor is associated with mutations in the WT1 gene, and genetic testing can help identify individuals at risk of developing this cancer. The WT1 gene is also involved in the development of other cancers, such as clear cell renal carcinoma.

**Correct Answer:** D. 11p13