Answer: 2) a research study published on a university’s website about how being in a zoo affects animals.
The most credible source on his list is option 2. With option 1, Roberto would only have access to subjective opinions, which are not a good source of evidence for research. Option 3 is an advertisement, which means that it does not contain a lot of information. It also means that it is likely to present zoos as a very desirable thing. Finally, option 4 is also likely to be subjective and biased, as the author is a zoo employee. On the other hand, option 2 comes from a research study published on a university's website, which means it is likely to be trustworthy.
"Incidents in the Life of a Slave Girl" by Harriet Jacobs has a classic, conversational and realistic style in which the reader feels as if he were talking to the protagonist. The narration is simple and attractive as in "I was born a slave, but I never new it till six years of happy childhood has passed away". Another key stylistic feature is the directness when addressing the reader as in "Reader, did you ever rate? I hope not".
