The one you have selected, C, is correct. The first choice says that the only digits in the answer is .21951. The second choice says that the .219 is not repeated, however the 51 will continue to repeat for forever. (.2195151515151...) The third choice says that .21951 will continue to repeat in that pattern for forever (.219512195121951...) The last option says that the 951 continues forever. (.21951951951951...)