When historians collect, classify, analyze, interpret, synthesize, and report data, they are using the scientific method chronological method research method historical method

Historical Method. because the scientific method starts off with a hypothesis

Iwould say the answer would be b

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.