Students in a large psychology class measured the time, in seconds, it took each of them to perform a certain task. The times were later converted to minutes. If a student had a standardized score of z = 1.72 before the conversion, what is the standardized score for the student after the conversion? 
选项为:A:z = 0.26  B:z = 1.03  C:z = 1.72  D:z = 1.98  E:The standardized score for the student after the conversion cannot be determined.  请回答其中一个选项.