The purpose of the Open Door policy was to provide the United States with access to trade with China.
Answer: Option A
Explanation:
In order to promote trade with China U.S. proposed Open Door policy in 19th century. This policy essentially professed that trade in China will be open to all the countries equally.
In 1899, John Hay who was U.S. Secretary of State had send the Open Door Note to all the major powers of Europe proposing this policy.
This policy was professed for avoiding the situation where any one power or country would establish its control over the trade with China. Hence the motive or purpose behind this policy was ensuring that U.S. has access to the trade with China.

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He wanted himself to change as much as he wanted others to change as well, but he saw that it was a very difficult task to change oneself, and by seeing that, he understood the challenges he would face when changing the people.
Answer:
Economic, social, and foreign policy problems.
Explanation:
Economic, social, and foreign policy problems are the main problems which affected the 13 colonies in building a new nation. the main problem is the economic problem which greatly affected the people of 13 colonies as well as the United states of America because the war against Britain weaken the economic condition of the country. It also experience social and foreign policy problems due to its long time living under the Britain.