In Kenya, the literacy rate for males is 90.6% while the rate for girls is 79.7%. In Sudan, 71.8% of males are considered literate as opposed to 50.5% of the female population.
Which statement BEST describes what is causing the difference in literacy rates for males and females?

A) Female students are less able to afford tuition to attend school.
B) Cultural norms and values place little emphasis on education for females in the two nations.
C) Female students are only required to attend school until age 7, while males attend until age 10.
D) Male students have greater literacy rates because of mandatory military programs in the schools.