Its the Open Door Policy, Answer C.
The Open Door policy originated in the treaty port system that emerged in China during the 1840s. For centuries, China had resisted the efforts of Western traders to penetrate the country, restricting their activities to the port of Canton (Guangzhou) and subjecting them to severe punishment for violation of Chinese law. Following Britain's sweeping military victory over China in the First Opium War from 1839 to 1842, however, the Qing dynasty had no choice but to grant major concessions. The British government forced China to open four new ports to foreign trade: Amoy (Xiamen), Foochow (Fuzhou), Ningpo (Ningbo), and Shanghai. British negotiators also insisted upon two privileges that would become hallmarks of Western imperialism in China. First, they demanded extraterritoriality, the right to subject British offenders to British rather than Chinese law. Second, they demanded most-favored-nation status, meaning that Britain would automatically benefit from concessions that China granted to any other country. In fact, as the historian Warren I. Cohen has observed, this demand for equal opportunity meshed well with Chinese calculations at the time. The imperial government, hoping to garner the goodwill of other Western powers to resist further British pressure, declared that all nations would have equal privileges in the treaty ports. "Now that the English barbarians have been allowed to trade," declared the Daoguang emperor, "whatever other countries there are, the United States and others, should naturally be permitted to trade without discrimination." In this way the United States, without firing a shot, came to enjoy the benefits that Britain had extracted through military intervention.
The correct answer to this open question is the following.
Although the question is incomplete because it does not provide any menu to see the options, we can say the following.
Different sources are aimed at different audiences. Sometimes a source can be directed at more than a single group of people. Documentary films are usually aimed at the general population across the globe. Some sources may have a very specific audience. A literary journal can be specifically aimed at students or scholars with a background in literature.
It all depends on the kind of audience or reader. It is very important that the author defines its audience and then try to collect the kind of correct source to support the information the author is about to share.
Many times documentaries are aimed at general audiences in order to create some kind of awareness about an issue. But in the case of a literary or scientific journal can be specifically aimed at students, researchers, or scholars with a background in those subjects. It is a specialized publication.
He was acting on the manifest destiny.
A unitary system of government is a monarchy. Which means that the country is ruled by one person or a group of people. An example of a unitary system is a country that is run by a royal family, that consists of kings and queens.
A federal system is a system is a system of government that is run but not ruled by a government that has many different political parties and many different people. The United States is an example of a federal system.