A worm is staying at the bottom of a well with a depth of $$13$$ metres. If it climbs up $$4$$ metres in the daytime and slips down $$1$$ metres at night, which day will it climb up to the ground? 
选项为:A:The $$4$$th day  B:The $$5$$th day  C:The $$6$$th day  D:The $$7$$th day  请回答其中一个选项.