The author develops the idea that great causes are worth fighting for primarily:
B. by describing the possible consequence of failing to resist oppression.
In the excerpt, Paine emphasizes the dire situation the colonies face under British tyranny and suggests that not standing up against oppression would lead to a form of slavery. He argues that such a state of being bound by tyranny is worse than death and presents the struggle for independence as a noble cause that must be fought for to avoid the greater calamity of oppression.