What does the quote “men would say of him that up he went and down he came without his eyes” from paragraph 33 mean in the context of the passage

The first step in synthesizing is to a. compare a particular source you are considering to the other sources you have already selected. b. parrot what other sources have said. c. ignore sources with information that runs counter to your claim. d. insert large chunks of information from one or two sources into your essay.