At what distance are a couple of friends likely to stand when in public?

Does anyone know the answers for questions 1-4? plz me out if you know

What impact did improvements in farming technology near the end of the nineteenth century have on the american economy? a. more energy was needed to power equipment, creating the renewable energy industry. b. less labor was necessary on farms, leading workers to pursue other jobs. c. less money was invested in farming as many locally owned farms went bankrupt. d. more demand for agricultural products reduced the price of food and animal products.

Which of the following contributed most to making the items listed in the box