Judging the sex of human remains in archeological research is of great significance for understanding the structure of ancient society. Scientists found that enamel contains enamel protein, and the gene encoding this protein happens to be on the sex chromosomes-X and Y chromosomes. It is believed that the method of determining the sex of the remains with teeth can be used for archeological research. Which of the following, if true, would best support the above argument? ['Teeth are the easiest to find and best preserved of ancient human remains.', 'No significant gender differences in bones of child remains.', 'The sex ratio of human remains is roughly the same as that of human society at the time.', 'Measuring certain skeletal features such as the structure of the pelvis can often directly determine gender.']