Pip and Bud are playing a game. Each time Pip has to flip a £$$1$$ coin. If Pip gets a head, Bud will pay him £$$1$$. If Pip gets a tail, Bud will take one of her coins. After they played $$50$$ rounds, how much would you expect Pip to gain or lose? 
选项为:A:Gaining £$$50$$  B:Losing £$$50$$  C:Gaining £$$25$$  D:Losing £$$25$$  E:Break Even  请回答其中一个选项.