Which of the following arguments shows why x−−√ may be rewritten in the form x1/2 ? A. Recall that 2x−−√=x1 . Since 2x1/2=x2(1/2) also equals x1,x−−√ must be equal to x1/2 . B. Recall that (x−−√)2=x1 . Since (x1/2)2=x1/2+1/2 is also equal to x1,x−−√ must be equal to x1/2 . C. Recall that (x−−√)2=x1 . Since x2=x1/2 , the sum x1/2+x1/2 is also equal to x1 . Therefore, x−−√ must be equal to x1/2 . D. Recall that x−−√+x−−√=x1 . Since x1/2+x1/2 also equals x1,x−−√ must be equal to x1/2 .