Gordon has the least number of coins (half-dollars, quarters, dimes, nickels, pennies) needed to make 99\cent. He randomly chooses one. What is the probability that it is a penny?<spanclass=′latex−bold′>(A)</span>51<spanclass=′latex−bold′>(B)</span>31<spanclass=′latex−bold′>(C)</span>21<spanclass=′latex−bold′>(D)</span>32<spanclass=′latex−bold′>(E)</span>43