The correct option is B The youngest president was 44 years old
On summing up all the frequencies, we get 4+11+14+9+4+2=44. Hence the total number of presidents is 44 and option A is incorrect. The graph starts from 39 but the corresponding frequency is 0. Hence, the age of 44 is the youngest age of president. Thus, B is correct and C is incorrect. The last point on the graph having non-zero frequency is 69. 74 has zero frequency and hence option D is incorrect.