A worm is staying at the bottom of a well with a depth of $$10$$ metres. If it climbs up $$3$$ metres in the daytime and slips down $$2$$ metres at night, which day will it climb up to the ground? 
选项为:A:The $$6$$th day  B:The $$7$$th day  C:The $$8$$th day  D:The $$9$$th day  请回答其中一个选项.