In "The feather pillow" by Horacio Quiroga when the parasites don't have a human to feed on they usually are small, they are parasites of feathered creatures. This parasite, in particular, has been feeding on Alicia's blood, that is why it became so monstrous. We learn about this in the last parragraph of the story.
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Answer: a is the right sanswer
Explanation: a is correct due to the fact that someone had to make an infrence as to why the bugs got in, so when they infrenece that the bugs had to get in somehow, therefore they concluded that someone left the door open.
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