For general measuring instruments, the uncertainty in the range of college physics experiments is 1~2 digits (2 digits are generally taken for measurement), and if the first digit is not greater than 3, it is taken as 2 digits; Otherwise, take 2 digits; The rest are rounded. Here are all 5, so take 1 bit, which is 0.05. So the mistake of C(D) is obvious, so I won't say it. In addition, the previous reliable figures are determined in principle according to the uncertainty (decimal point alignment), through which A can be directly excluded.