The correct answer is: C) Farm
Tiv is an ethnic nation in West Africa, they have a significant population in Nigeria and Cameroon.
The most important thing to take in consideration is that their economy is dependent mostly in agriculture, therefore on rainfall. Amongst their most important products we can find roots, cereals, fruits and vegetables. They also raise animals like goats, cattle, pigs and chickens.
You can see why rain is so important for them as it allows the growth of all those species. Whe rain is scarce they do everything to bring it back, they are well known for using rain makers, who make rituals to make it rain.