It is b, as some word checkes don't recognize modern slangs. 
        
             
        
        
        
Answer:
unfortunately you cant change your username.... i tried 2 and the only way is to make a new account
Explanation:
 
        
                    
             
        
        
        
No???? Yes. Maybe. I don't know. Why is this relevant? <span />
        
                    
             
        
        
        
D. 0.0001.......first the zero before the decimal point is devided by 2....so it gives out 0 as a reminder so u right 0. at first then to do the part after decimal...first multiply 0.625 by 2 which gives out 0.125 as a fractional number so 0 would be the number after "0." ...and again the answer 0.125 is multiplied by 2 which gives out 0.25....so again we get a zero as an integer so now it would be "0.00..." ....again multiply 0.25 by 2 which gives out 0.5....again the integer is 0....so we add another 0 after 0.00....which would then become 0.000.....after that again multiply 0.5 by 2 which would give 1 as a result....as the fractional part is over, u need to stop here....so add that 1 after the 0.000 which gives 0.0001 as a final result.