B. Mao's focus on rural steel production led to widespread famine and starvation.
Due to the immense focus of the rural population on producing steel, and environmental disasters (Great Chinese Famine, 1959-1961), the resulting consequence was failure to produce enough food to sustain the population (leading to widespread famine and starvation).
I think it’s C School segregation.
The lasting effect of religious missionaries in Africa is that they spread Christianity. They established hospitals, clinics and offered modern medicine. They introduced European system of management and styles of dress. The Missionaries opened schools. Also training colleges too. They paved the way for the improvement of agriculture through establishing farms where new crops and better methods of farming and equipment were introduced. Furthermore, the missionaries fought slave trade. They also destroyed local industries like craft industries which were replaced with European products. Moreover, some African religions were lost to Christianity.
I believe the answer for your question is C