Highly doubt this is a GMAT Prep question...this has the smell, flavor and taste of an LSAT question...Plus the logic used in this type of question is tested frequently on the LSAT...But that said -- lately I keep hearing that GMAC's CR questions are stretching the limits and are no longer sticking to the standard assumption, weaken/strengthen, inference and flaw questions.
So they give out more resolve the paradox type questions and boldface?
This is purely subjective -- so take it with a big scoop of salt. These are observations I have gathered from some colleagues and friends who have taken the GMAT within the last year or so.
Yes -- definitely more Boldface questions -- especially if you are doing well. A couple of my friends took the test a few weeks back -- and both mentioned they hardly saw 2, 3 or 4 strengthen / weaken questions tops. And even those were questions with "all of the following except" constructions. One of them said she got at least a couple of "evaluate the plan" and "the author is most likely to agree with all of the following except" type of questions.
Another interesting observation -- One of them said he saw just one probability question and zero combination questions (Quant 48). The general feedback was that co-ordinate geometry, number properties -- especially prime number, consecutive numbers, even-odd and integer properties, functions, percents and exponents seem to hold "high-value".
CAT question. Official answer is D and the key to solve this problem is to pay attention to the word "only" in the phrase "will only cooperate if...". This is the only necessary condition to weaken the defendant's case - others are not necessary conditions (e.g.: Elvira Johnson agreees, prestigious law firm takes the case, etc).