Humans are members of the taxonomic order of primates. What scientific reasoning is used to place humans in this classification grouping? please help me quick!!!

Cladistics refines classic taxonomy by linking organisms, based on the presence or absence of unique characteristics, into “grades.” For example, if three species share a suite of characteristics but only two of them have a particular trait that is not present in more distantly related species, those two are more closely related and would be depicted as a separate grade.

answer; i believe the correct answer is (replication is not conservative);