Answer:
A). To establish historical precedent for his actions.
Step-by-step explanation:
Allusion exemplifies the direct and concise reference to a thing, place or person that carries cultural, historical, political or literary importance and often suggests an implied sense. King wrote several letters from Birmingham Jail and alludes to different people and places with an intended message. In this excerpt also from "Letter from Birmingham Jail”. King employs allusion to 'Boston Tea Party' in order to establish the historical criterion to the readers and symbolize the significant and enormous act of civil disobedience. Thus, the answer is option A.