Concept:"Dispense" means to give out or administer, which is exactly the action a judge performs with justice.
Explanation:The blank requires a verb that correctly matches the object "justice."
"Dispense justice" is the standard legal expression meaning to administer or deliver justice.
Dispense means to give out, pass, or apply something, like a judge passing a fair judgment.
Let us check the other options.
"Defer" means to postpone or yield, which does not fit the context.
"Define" means to explain the exact meaning, which is not the required action.
"Dispel" means to drive away or scatter, which also does not fit.
Only "dispense" logically completes the sentence.
Hence, a judge is required to dispense justice fairly.
Answer:B. dispense — A judge is required to dispense justice fairly.