Before yesterday: Sunday  Yesterday: Monday  Today: Tuesday  From Tuesday to Sunday, we have $$5$$ days based on the information given in the question. 
If the day before yesterday was Sunday. How many days are there from today until Sunday? 

1: $$2$$ 
2: $$3$$ 
3: $$4$$ 
4: $$5$$ 
5: $$6$$ 