The answer to your question is d
B) The bill required a greater show of loyalty for readmittance than Lincoln's plan.
Primary source is the firsthand experience and evidence of an event, where the any given information first appeared (initial report). The secondary source uses the first source in order to give its information (for example: document that analyzes primary source documents).
When analyzing historical event a researcher use a secondary source instead of a primary source because he uses the primary source as the imput information (facts, events, dates, names) in order to analyze them, connect them and explain them in his work.
Hey there,
The Battle of Britain<span> changed </span>war<span>, and the world, forever. ... It was a four-month campaign against the United Kingdom waged by the German Air Force, or Luftwaffe. It was the first large campaign </span>fought<span> only by air forces. And it was Germany's first major defeat in the Second World </span><span>War.</span>