As long as we can find the factor $2$ and $5$, the ones digit is $0$. 
The ones digit of $$1!\times2!\times3!\times ···\times50!$$ is~\uline{~~~~~~~~~~}~. 
Options:
A) $$0$$ 
B) $$1$$ 
C) $$2$$ 
D) $$4$$ 
E) $$6$$ 