Interviews are in person, therefore there may be interviewer and interviewee bias in regard to the questions being asked. Only so many interviews can take place during any given period of time. Surveys eliminate interviewer and interviewee biases. And surveys can reach a large majority of people. However, surveys are only good if they are actually returned.
Hope this helps! :)
Answer: A) A. He wanted Vice President Arthur, a Stalwart, to take office.
President Garfield was a reformer who was against the Patronage Spoils System (a system that allowed you to get a job in the government even if you were not qualified).
Guiteau supported the Patronage spoils system, therefore he wanted a Stalwart to be President so the patronage spoils system would not be abolished.
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Francisco Vázquez de Coronado</span>