The question is examining the understanding of terms related to financial challenges for railroads. The correct answer is A because 'bankruptcy' is a legal status of a person or other entity that cannot repay debts to creditors. Option B is incorrect because 'planning' refers to the process of making plans, not a financial challenge. Option C is wrong because 'subscription' refers to the act of subscribing to a service or publication, not a financial term related to railroads. Option D is incorrect because 'mismanagement' refers to the poor management of something, which could lead to financial issues but is not the term specifically mentioned in the context.