JAMB - Geography (2015 - No. 18)
The predominant systems of agriculture among rural farmers in Nigeria is
terrace farming
irrigation farming
plantation agriculture
bush fallowing
Обяснение
D is correct, because, it is also shifting cultivation. It is a system of farming or the cultivation of one pieces of land for some years and leaving it for some years with the aim of restoring fertility to the soil naturally but during this fallow period, the farmer cultivates another pieces of land.