Assume That,upon Divorce,Alan Is Ordered by the Court to Pay

Assume that,upon divorce,Alan is ordered by the court to pay permanent alimony to his former wife,Margaret,in the amount of $3,500 per month.Three years later,which of the following factors could be a proper legal basis for Alan's application to the court for a reduction in the amount of alimony he must pay to Margaret?

A) Margaret loses $100,000 when her house is damaged by a flood.
B) Alan gets a substantial raise of $25,000 a year.
C) Margaret remarries.
D) all of the above