77 LR One Question 4
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Permalink Submitted by Sohyun Kim on Nov 28 2017
Hey Dave
Why E can't be an answer? the Birds that prey on songbirds are also predator of cardinal, so I though it will attack 'proliferation' in the conclusion

Permalink Submitted by majorgeneraldave on Nov 30 2017
(E) strengthens the argument in the classically expected way; it makes the causal claim more likely by removing an alternate cause (the boom did not happen because of a decline in predators).