Who could be a citizen in Ancient Rome

In the late Republic, male slaves who were granted their freedom could become full citizens. Around 90 B.C.E., non-Roman allies of the Republic gained the rights of citizenship, and by 212 C.E, under the Edict of Caracalla, all free people of the Roman Empire could become citizens.

crop rotation kepy different plants in the soil instead of once constintly. when switching out plants you have different nutrients being absorbed at different speeds and different roots growing differently therfore the spoil and water flow have to adapt and carry fresh nutrients to carry the constant changes that were going on in the soil.

yup! you are correct it is b.