It doesn't matter how many books each person surveyed had read. We're just interested in each person picking one book and naming it as having the \"most influence\" on his or her life.

If many people chose books other than 1984, then 1984 may not have needed all that many votes to come in second place. Again, suppose 8 people chose the Bible, 490 people each chose their own individual book, and 2 people chose 1984. 1984 would still be in second place, but wouldn't have influenced a great number of readers. This information would help evaluate the argument.

This answer choice is trying to make us question whether the sample of people surveyed is representative. But we don't have any reason to doubt that from the stimulus, and even if there were many more than 1000 readers of this magazine, the sample size of 1000 could still be representative. The sheer quantity of readers, on its own and without additional information, wouldn't be especially useful in evaluating this argument.

We’re not interested in other Orwell books. Even if some were chosen, we know they ranked lower than 1984, and knowing only how many other Orwell books were chosen (rather than how many other books were chosen overall) wouldn't help us gauge whether a \"great number\" of people picked 1984.

The argument just says people cited these books as having \"the most influence\" on their lives: this doesn't necessarily mean they've read it for themselves.