The only correct answer the change in labor income is less than the percentage change in the relative price of manufacturing goods. Labor will always be needed, so there’s little reason for the income of the laborers to change. However, with a sudden increase in demand for high-tech goods and a lower demand for agricultural goods, the prices will change. This is the supply and demand curve.
For those who don’t know what the supply and demand curve is, it’s simply a curve that shows that as demand goes down, supply goes up. If demand goes up, supply goes down. It’s also meant to help price items. As there is less demand and more supply, price goes down. If there’s more demand and less supply, price goes up.