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.
To my knowledge, the correct answer among all of the given choices is C.) Steam. If I'm not mistaken, this was the time that more trains came into use.
I hope this is the answer you were looking for and that it helps!! :)
The Jet Stream hope it helps
Answer:
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Answer: Oil.
Japan wanted southern Indochina's supply of oil as they were starved for it and unable to maintain their military. On the same day they attacked Pearl Harbour they also attacked the Philippines to gain access to this oil. The attack on Pearl Harbour was to prevent any armada of US ships from retaking the Philippines, which they succeeded at doing.
Hope I helped and please rate my answer :)
