The best way to measure public opinion is through opinion polls - B
With opinion polls you get an idea what is the general idea about a certain topic from the public, as you usually get a high enough sample to deduce the relevant information.
To answer your second question I would say it is either B or C as being a sole proprietor usually makes you subjec to being a small business or you're forced to use factors of production less efficiently.
Juan Peron was the President of Argentina (The correct answer). Specifically, e was the president before and after his exile. The exile was caused by the military regime that was in power between those two presidencies.
Answer:
Wheat
Which of these was the least commercial crop for the Middle Colonies? Wheat.
Explanation:
Well without a description om shooting in the dark. But id assume that the answer is Trench Warfare. Since A- was around since contact with Native Americans and largely popular in North America. B- Only was used and discovered in WW2. And C- was used but was largely frowned upon and condemned by both sides.<span />