Self-study
Citizen's Sufficient Condition: Interest in helping the economy
Citizen's Necessary Condition: Building a business park
That is to say, if one has an interest in helping the economy it is a given that they would build a business park; if they do not build a business park then there is no way they have an interest in helping the economy.
Question is NA, focus on the above necessary condition when looking at answer choices - If she did not believe that building a business park would help the economy, then fail necessary -> fail sufficient implies she has no interest in helping the economy, which disagrees with the assumption that she does not believe that the business park would help.
In other words, if she does not believe a business park would help she could still be acting in the economy's best interest by doing what she believes would help. This is why it is required for the citizens to assume she knows that building a business park is better than the highway.
Birds that prey on songbirds became more common between 1980 and 2000; it doesn't say anything about them being most common during that timeframe. This would likely drive songbirds away from Nova Scotia.
I also had to make assumptions as to what wintering meant so I was stuck on this question for a while, but I chose A over E because at least A provides an alternative reason rather than providing a reason to refute the support offered for the conclusion, which is what E does.