Which three rights are mentioned as unalienable in the declaration of independence?

Ithink it's a, but i might be wrong

The changes to agriculture in the united states since 1900 is that increased mechanization has increased food production, thereby increasing the need for labor. there has been an increased need for higher speeds of food production due the fact that the population in the united states continues to rise.

Complementary goods. they go together, thats why one price increase and the others demand increases