Recent research has indicated that married people are not only happier

My approach to CR question is first to determine the flaw in the argument (if the stimulus is an argument as oppose to statement of fact). Especially with an assumption question, the argument is most likely to be flaw. For instance, in this question, the flaw is correlation an causation. The commentator claims that just because there is a correlation between marriage and happiness + health benefits, you can conclude that marriage is good for your health and mental attitude.

As for me, I was down between C and D as well.

Answer choice D is correct because address this flaw in a very sneaky way. Choice D address this correlation and causation issue by eliminating the possibility that depression and health issue is actually causing people to NOT get married by saying that
" Single people with depression or health problems are just as likely to get married as are other single people."

If we negate answer choice D, then we'll see that the conclusion above does not hold. If we negate choice D, we'll get "Single people with depression or health problems are NOT AS LIKELY to get married as are other single people." This show that there are actually a reverse correlation between marriage and depression.


Answer choice C: is incorrect because as stated earlier, if we negate C. The conclusion still holds. This example might help for those of us who still think C is correct. What if I say that running 10 mile is a good for your cardio and fat loss, and some body (answer choice C) argues that runners cannot get fat, would this weakened my argument above. This is very similar to answer C on the question, just because you get married that doesn't mean that you will never be depressed. You might be happily marry for en year and then one day you found out that your husband or wife had an affair with your best friend. Furthermore, both of your parents are suffering from brain tumor. Any reasonable person would be depressed.