Final answer:
Charlotte Lucas may justify her contentment with Mr. Collins by emphasizing the practical benefits and security her marriage brings, in line with the social norms of Jane Austen's era.
Step-by-step explanation:
Charlotte Lucas's contentment with her marriage to Mr. Collins can be explained by her belief in the practicality and stability of marriage. She might not be swayed by romantic ideals but rather looks to the social and economic benefits that the union provides. In the context of Jane Austen's work, where women's financial security heavily depended on a 'good' marriage, Charlotte's decision underlines the social norms of the era. It's likely that Charlotte would explain her contentment to Elizabeth by emphasizing the comfort and social security her marriage to Mr. Collins brings, along with the status of being the mistress of a large estate.