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.
The correct answer is A. The man who assassinated Kennedy.
Explanation
John F. Kennedy (1917-1963) was the president of the United States from 1961 to 1963 when he was killed in the city of Dallas in the state of Texas by Lee Harvey Oswald, who days later would also be killed by Jack Ruby in a confusing episode when he was being taken to an investigation before a judge. The reasons for Lee Harvey Oswald to assassinate the president are uncertain, but when he was killed a few days after the President's assassination there was no clarity about the fact beyond the insistent self-declaration as innocent of Harvey Oswald. So, the correct answer is A. The man who assassinated Kennedy.
Answer:
Battled fiercely for control of the land
