Answer:
Option B, the allosteric site, is the correct answer.
Step-by-step explanation:
Noncompetitive inhibitors do not compete with the substrate for the active site; instead, they bind to the allosteric site and modulate enzyme activity through allosteric regulation. Option A, the active site, is where substrate binding occurs, and noncompetitive inhibitors do not bind there. Option C, the sympathetic site, is not a recognized term in the context of enzyme inhibition.