The right answer is huge.
A LOS QUE NO TIENEN CONVICCIONES SON FACILES DE MANIPULAR
They couldn't because of their code if honor
The correct answer, in my opinion, is C. <span>There is within me (and with sadness I have watched it in others) a knot of cruelty borne by the stream of love, much as our blood sometimes bears the seed of our destruction, and at times I was mean to Doodle.
The narrator recalls his own cruelty, but also hints that this cruelty (and its consequences) will haunt him forever. At this point, we anticipate that he is going to do something bad to Doodle, even though the narrator softens this anticipation by telling us that it used to happen "at times". Also, the simile "much as our blood sometimes bears the seed of our destruction" tells us that the narrator will never break free from this regret.
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Generally speaking, that is correct. A dystopia is the opposite of a utopia, and is a place which we define as unpleasant or bad. Therefore, what you might find in a dystopia is what you would consider as being unpleasant or bad. Hence, if you think polluted lakes and rivers are unpleasant, then they are likely to be part of a dystopia "for you". However, each person's dystopia may be different, as it depends on personal preference, or in this case, personal disgust.