A. the end of the United States alliance with Great Britain
Mother's day is on different days in different countries - and in the US it's always on Second Sunday in May, which in 2016 is May 8th.
In some other countries it's on other days: for example it's always on 10th May in Mexico or first Sunday in May (Spain and Hungary, for example)
Among the options provided, the one that answers the question is letter B: "It meant people didn't have to give up their old gods when converting to Hinduism".
He is trying to warn you to tell you someone is here. There are also telling you they will be ready for whoever enters your home.
