MAKING the interchanges GIVEN in (a), we get the equation as \[2-5+3=0\]or \[0=0\] which is true. By making the interchanges given in (b), we get the equation as \[3-2+5=0\]or \[6=0,\]which is FALSE. By making the interchanges given in (c), we get the equation as \[5-3+2=4\]or \[4=0\] which is not true. So, the ANSWER is (a).