I think it’s D. Sorry if I’m wrong.
The right answer is A. the Mississippi River to the Rocky Mountains.
The Louisiana territory, initially populated by Indians, then settled by the French, had been ceded to Spain in 1763. Since that time the dream of retaking Louisiana had stirred the French, and the audacious general Napoléon Bonaparte had retrieved it for France from his Spanish allies in 1800. Napoléon was willing to sell the Louisiana Territory because his French army in Saint-Domingue (Haiti) had been decimated not only by a massive slave revolt but also by yellow fever. Concerned about financing another round of warfare in Europe, Napoléon decided to cut French losses in the Americas by selling the entire Louisiana Territory and thereby gaining cash for his ongoing war with Great Britain. Great Britain. By the Treaty of Cession, dated April 30, 1803, the United States obtained the Louisiana Territory for about $15 million.
Advantages: Primary sources directly address your topic and often provide information that is unavailable elsewhere. For example, the questions you compose for an interview or a survey will likely target your unique interest in the topic. Similarly, to test a particular hypothesis, you can design your own experiment.
Disadvantages: Some primary sources, such as eyewitness accounts, may be too close to the subject, lacking a critical distance. Others, such as interviews, surveys, and experiments, are time consuming to prepare, administer, and analyze. Finally, unless you have been trained in accepted methodologies, your own primary research in certain fields of study may not be recognized as valid.