<prompt> Most stable radio-isotope among the followingO 18C 14P 32I 125  <response>: O-16,O-17, O -18 are stable radioisotopes of oxygen.C-12, C-13, are stable radioisotopes of carbon not C-14.P-31, is stable radioisotopes of phosphorus not P-32.1-125 is radioactive form of iodine not stable. 