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.
The Jet Stream hope it helps
Answer:
Emperor Qin Shi Huangdi was an effective leader because he helped form China. He was the first Emperor of China, and helped form it into the country it is today. He built many new things to help China improve throughout his reign. He did many good and bad things, but was a very effective leader.
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Answer:
Many ex-colonies experienced economic decline due to a disruption in trade following decolonization.
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