Turns and loosens soil, improving it for crops, but leaving soil vulnerable to erosion.
a. grazing
c. plowing
b. no-tilling farming
d. terracing

The correct answer is - c. Plowing.

The plowing is a process that can be both useful and damaging on the long run for the soil and for the farming on it. This is because the plowing is enabling the biomass from the top layer to come deeper into the soil, thus fertilizing the deeper parts, and also loosens it, and that is excellent for most plants, but on the other hand, because of the loosening of the soil it is making it much more exposed and vulnerable to the process of erosion. Because of this, it is recommendable that the plowing is performed in a step-style manner, so that flatter surfaces can be created, thus reducing the effects of the erosion and preserving the soil for much longer time.

d. new methods of assembly are introduced.

explanation:

this allows for the goods to be made on a larger scale. not faster because now it is shown to be made better, hence the greater productivity in the question. it is calling for something new to be introduced.