59 LR One Question 3
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Comments

I do have some trouble. Though I answered it correctly, you said that any support would suffice. But why then only (A) works?

Only (A) presents us with support for the conclusion about catching accidental large credits!

I think I am starting to overthink things. I didn't choose A because I thought there was no way to know that the computer programs would work and do a good job. How do I pull myself back from this kind of thinking?

I think there are two things that will help:
1. Remember the demand of the question. Here, we need an answer that makes the argument better, but not necessarily an answer that proves the conclusion. So, yeah, you're totally right that we don't know whether to second set of programs works, so (A) doesn't prove anything. But the very existence of the programs does make it more likely that they'd catch an error.
2. Develop an answer before looking at answer choices. Even if it's only a purely structural one! For example, here, you might say to yourself "They're claiming that a bank would be likely to catch an accidental large credit. So the right answer makes it more likely that they would notice a large error."
Make sense?