Which statement below is most consistent with research on gender and cross-cultural differences in obedience to authority?
a. Cross-cultural differences in obedience to authority have been demonstrated to exist, but not gender differences.
b. Gender differences in obedience to authority have been demonstrated to exist, but not cross-cultural differences.
c. Both gender and cross-cultural differences in obedience to authority have been demonstrated to exist.
d. Significant gender and cross-cultural differences in obedience to authority have not been demonstrated to exist.