Which sentence, spoken by marley, supports the story's theme that a person's duty is to fellow human beings?

a.
oh blind man, blind man!

b.
in life i was your partner, jacob marley.

c.
i cannot rest, i cannot stay, i cannot linger anywhere.

d.
mankind was my business.

To improve your understanding of an informational text, the question you should ask yourself as you read is: do i agree with what the author says in this text? who assigned me to read this text? what details in the text are unclear to me? what other texts has this author written?

She took up a scalpel and slit the monkey's abdomen, making a slow and gentle cut, keeping the blade well away from her gloved fingers. the spleen was puffed up and tough, leathery, like a globe of smoked salami. she did not see any bloody lesions inside this monkey. she had expected that the monkey's interior would be a lake of blood, but no, this monkey looked all right, it had not bled into itself. if the animal had died of ebola, this was not a clear case. she opened up the intestine. there was no blood inside it. the gut looked okay. then she examined the stomach. there she found a ring of bleeding spots at the junction between the stomach and the small intestine. this could be a sign of ebola, but it was not a clear sign. it could also be a sign of simian fever, not ebola. therefore, she could not confirm the presence of ebola virus in this animal based on a visual inspection of the internal organs during necropsy.

Which function is positive for the entire interval (-3, -2]?