Would this answer be wrong then because the conclusion is just "The media now devote more coverage to crime than they did ten years ago."
That's not the conclusion. It's just a fact.
Even though the author does not use the word "justify" is he/she not essentially saying that the crime rate by itself is not sufficient to justify the increased media coverage of crime. Rather he cites that the public is now more interested in reading and hearing about crime.
Now, this points to the correct sentence for the conclusion, but the author is not saying anything about the sufficiency of the crime rate for justifying the increase in exposure. Again, we don't even know whether the crime rate has actually increased or not.
To simplify things, forget that part for a moment and get down to the CORE, the bare essentials of this argument:
1. media covers more crime than 10 yrs ago
2. media decides what to cover based on audience interest
Therefore: media covers more crime because public is more interested in it.
The question is asking "what role does the part about the public being more interested play?" Answer? It's the conclusion. Sweet.
A, B, and C drop like flies.
(D) is an easy elimination because that claim is never made.
(E) bingo. "Alternative explanation" = "explanation" = "conclusion." We might ask, alternative to what? Now that irrelevant part comes into play -- alternative to the idea that the crime rate was responsible for the increase in coverage.
I think the key takeaway here is not to get tangled up in playing a game that we don't need to play. Logical Reasoning is all about efficiency and the CORE. Don't mess around with more than the bare minimum unless you have to.
Here's an analogous argument that might be easier to see:
I'm eating more than I did last month. And this is not because of the purple elephant in the backyard, but rather because I'm now exercising more. After all, a big factor in food consumption is the amount of physical activity a person participates in.
Are there really purple elephants? Is there really one in the backyard? Who cares!! There are literally INFINITE "non-reasons" for my eating more. What's the point of my argument? The REASON is, exercise. The non-reason is simply a distraction.