Well, the octopus makes a screen so it can distract its enimies...
~You know how in real life, how a screen-door can keep out the bugs, per-say? Well, an octopus's screen, can keep out the enimies from seeing it. Leaving it able to get away.
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<em>Hope this helped! :)</em>
Either b or d, but i think your best bet is with d.
Answer:
He tells Rainsford that he had come to the point in his life that he felt bored with every other type of animal because "they were no match at all for a hunter with his wits about him and a high-powered rifle." Basically, there was no more intrigue or excitement in hunting for Zaroff, so he decided to hunt man.