Final answer:
Adut and Akot likely planted sorghum or pearl millet, which were staple cereal grains historically cultivated in sub-Saharan Africa, particularly in the region corresponding to modern Sudan.
Step-by-step explanation:
The question refers to the staple cereal grains that Adut and Akot could have planted in early April. Considering the historical context provided, it is likely that they would have planted either sorghum or pearl millet, which were some of the first crops cultivated in sub-Saharan Africa according to historical agriculture practices.
In the grasslands south of the Sahara, agriculture emerged independently with the domestication of wild grasses. Sorghum and pearl millet were some of the tropical grasses of the Nile region that were collected and later domesticated by the Nilo-Saharan people. These grains were cultivated thanks to grain-collecting and grinding techniques adopted from northern neighbors, transitioning from gathering wild grains to deliberate domestication.
The introduction of these grains as staple crops led to the development of agricultural practices in regions such as modern Sudan, leveraging a millennia-long wet phase that made the region fertile and conducive to agriculture. This would have enabled Adut and Akot to actively cultivate these grains.