What sort of farming defined the first type of agriculture?

sustenance
seasonal
subsistence
supplementary

So I would say B. Seasonal

Explanation:

Wheat and barley are some of the first crops people grew. People probably started agriculture slowly by planting a few crops, but still gathered many foods from the wild. People may have started farming because the weather and soil began to change.

i was thinking 4.0 v hope this

"it built up in the atmosphere"

i think thats it, idk, i tried looking for this exact q& a for grad. and idk if i got this question right or sorry if im wrong