Okay, let's tackle this question. The patient is a 16-year-old with bowel obstruction and enlarged para-aortic lymph nodes. The biopsy shows a diffuse infiltrate of small, round lymphocytes with a "starry sky" appearance and vacuolated cytoplasm positive for fat stains. Hmm.

First, I need to recall what "starry sky" appearance means. I think that's a hallmark of Burkitt lymphoma. The term comes from the presence of numerous macrophages with phagocytosed lymphocytes, creating a starry sky pattern under the microscope. Also, the vacuolated cytoplasm and positive fat stains suggest lipid accumulation, which might be due to the high proliferative rate and apoptosis in Burkitt's.

Now, the question is about what the neoplastic cells would demonstrate. The options aren't given, but common markers for Burkitt lymphoma include CD20 (B-cell marker), CD10, BCL6, and the translocation t(8;14)(q24;q11), which involves the MYC gene. So the correct answer is likely related to one of these markers.

Wait, the options might include immunohistochemical markers. Let me think. If the options are about translocations, then t(8;14) is key. If they're about proteins, then CD10 and BCL6 are positive, and MYC is overexpressed. Also, EBV is associated with some cases, but not all. The other options might be markers for different lymphomas. For example, follicular lymphoma has t(14;18), and diffuse large B-cell lymphoma has different markers. So the correct answer would be the translocation involving MYC, which is t(8;14), leading to MYC overexpression. That's the key here. The other options would be incorrect if they refer to different translocations or markers.

**Core Concept**
This question tests knowledge of **Burkitt lymphoma**, a high-grade B-cell lymphoma characterized by a **cytogenetic abnormality involving the MYC gene**. The "starry sky" appearance and vacuolated lymphocytes are classic histologic features.

**Why the Correct Answer is Right**
The **t(8;14)(q24;q11)** translocation is a hallmark of Burkitt lymphoma. This translocates the **MYC proto-oncogene** from chromosome 8 to the immunoglobulin heavy chain locus on chromosome 14, leading to **constitutive MYC overexpression**. The translocation drives uncontrolled B-cell proliferation, explaining the aggressive nature of this lymphoma. The "starry sky" pattern results from macrophages engulfing apoptotic tumor cells, while vacuolated cytoplasm reflects lipid accumulation due to rapid cell turnover.

**Why Each Wrong Option is Incorrect**
**Option A:** *t(11;14)(q13;q32)* is associated with **mantle cell lymphoma**, not Burkitt.
**Option B:** *t(14;18)(q32;q21)* is characteristic of **follicular lymphoma**, involving BCL2 overexpression.
**Option C:** *t(2;5)(p23;q35)*

✓ Correct Answer: D. t(8;14) translocation