Using the terms in Robert Merton's strain theory, which of the following concepts correctly describes the behavior of a radical activist who rejects just about everything in the existing society in favor of some alternative system?
a) innovator
b) ritualist
c) retreatist
d) rebel

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.