**Core Concept**
Proteasome inhibition is a therapeutic strategy used to modulate protein degradation in cells, particularly in cancer treatment. This concept involves the inhibition of the proteasome, a complex responsible for degrading ubiquitinated proteins, thereby regulating various cellular processes.

**Why the Correct Answer is Right**
Proteasome inhibition prevents the degradation of specific proteins, leading to the accumulation of these proteins and the subsequent activation of various signaling pathways. Bortezomib, a proteasome inhibitor, binds to the 26S proteasome and inhibits its activity, resulting in the accumulation of ubiquitinated proteins. This leads to the activation of NF-κB, a transcription factor involved in cell survival, proliferation, and apoptosis. The inhibition of proteasome also affects the cell cycle, leading to cell cycle arrest and apoptosis in cancer cells.

**Why Each Wrong Option is Incorrect**
**Option A:**
This option is incorrect as it does not directly relate to proteasome inhibition.
**Option B:**
This option is incorrect as it involves a different class of drugs that target a different pathway.
**Option C:**
This option is incorrect as it involves a mechanism of action that is not related to proteasome inhibition.

**Clinical Pearl / High-Yield Fact**
Proteasome inhibitors, such as bortezomib, are used in the treatment of multiple myeloma and mantle cell lymphoma, highlighting the importance of protein degradation in cancer cell biology.

**Correct Answer: B. Bortezomib**