Answer:
(D) . TLR activation.
Step-by-step explanation:
Nuclear factor kappa light chain enhancer of activated B cells (NF-κB) represents a protein complex, which plays various roles in activation of adaptive and innate immune response.
TLRs (toll-like receptors) are specific pattern recognition molecules found in pathogens that triggers immune responses. TLR activation stimulates activation of NF-κB signalling by triggering a downstream signaling cascades.
Activation of NF-κB signalling leads to upregulation of various pro-inflammatory substances or cytokines.
Thus, the correct answer is option (D).