Final answer:
The impediment to Matilda's marriage is not listed in the provided options, but based on historical context, financial difficulties related to dowries and financial estates are a likely barrier.
Step-by-step explanation:
From the context provided, it seems that the correct answer about what gets in the way when Ms. Ogiville suggests that Matilda should be married is not listed directly in the options (a) Matilda's illness (b) Family expectations (c) Financial difficulties (d) Romantic interests. However, drawing a parallel to similar historical situations and understanding the time's social context, one could infer that the issue at play is likely related to financial difficulties, as it is mentioned that Dorothy has bills to pay and is anxious about money. Additionally, wedding arrangements of that era often involved financial concerns, such as dowries and merging financial estates, which could impede marriage plans. Dorothy's situation, where she is relying on her brothers for financial support, reflects the period's reliance on family for such security and hints that financial challenges might affect matrimonial prospects.