**Core Concept**
The question is testing knowledge of the genetic translocations involved in B-cell lymphomas, specifically the role of the BCL2 gene. BCL2 is an anti-apoptotic protein that prevents programmed cell death, and its overexpression contributes to lymphoma development. The question is asking about the specific chromosomal translocation associated with BCL2 in B-cell lymphoma.

**Why the Correct Answer is Right**
The correct answer involves the t(14;18) translocation, which is a chromosomal rearrangement where the BCL2 gene on chromosome 18 is fused to the immunoglobulin heavy chain (IGH) gene on chromosome 14. This translocation leads to the overexpression of BCL2, promoting lymphoma cell survival. The t(14;18) translocation is a common genetic abnormality in follicular lymphoma, a type of B-cell lymphoma.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it does not specify a known translocation involving BCL2 in B-cell lymphoma. Other genes may be involved in different types of lymphomas.
* **Option B:** This option is incorrect because it is not a known translocation involving BCL2. Other genes may be involved in different types of lymphomas.
* **Option C:** This option is incorrect because it does not specify a known translocation involving BCL2 in B-cell lymphoma. Other genes may be involved in different types of lymphomas.

**Clinical Pearl / High-Yield Fact**
The t(14;18) translocation is a common genetic abnormality in follicular lymphoma, and it is often used as a diagnostic marker. It is essential to recognize this translocation in the context of lymphoma diagnosis and treatment.

**Correct Answer:** t(14;18)