If the city builds the proposed convention center, several national pr

The correct answer choice is (E).

Explanation by Powerscore
The argument presents several conditional claims with no qualifiers - no element of probability, just absolute certainty.
The author is completely certain, based on these conditional claims, that "building the convention center will increase the city’s tax revenues"(the last sentence).
The stem asks us to justify (prove) this conclusion, which means despite how certain the author sounded, there must be something missing from his argument, something which when we supply it will complete the conditional chain and guarantee the truth of the final sentence.

The conditional premises are as follows:

BCC (Build Convention Center)
SNOC (Several National Organization Conventions)
SLC (Several Large Conventions)
VI (Visitors Increase)
TRI (Tax Revenues Increase)

The conclusion is:
BCC >> TRI

At this point we should notice that there is a slight shift between the first and second premises, from SNOC to SLC, and that is the gap which, once we close it, will get us all the way from the first sufficient condition to the final necessary condition.
Our prephrase must be along the lines of "if there are national organization conventions, they will be large."

Answer choice (A): VI>>TRI, the negation of the final premise, does not connect the conditions in our chain and does not match our prephrase. Loser.

Answer choice (B): VI >> MSVI (money spent by visitors increases) brings up a new condition and does not connect the building of the convention center to increased tax revenues, the conclusion we are seeking to justify.

Answer choice (C): TRI>>BCC is a reversal of the conclusion, which does nothing. A contrapositive would have done the job, but this is not that.

Answer choice (D): BCC>>>RVC (regular visitors continue) brings up a new condition and does not connect the building of the convention center to increased tax revenues.

Answer choice (E): This is the correct answer choice. SNOC>>>SLC closes the gap and matches our prephrase perfectly. We now have this complete conditional chain:

BCC>>>>SNOC>>>SLC>>>>VI>>>>TRI, and
it must be true that BCC>>>TRI

Posted from my mobile device

I just couldn't believe someone is testing me on such a concept.
Of course, I blundered it

Hello experts,

Can't this question be considered as cause and effect question? please explain. Also, what is the contrapositive of the conclusion.