Five years ago, only every fifth resident of Korovia owned a credit ca

conclusion : telemarking campaign caused growth rate and so credit card companies want to invest in telemarketing campaigns.
causal conclusion can be weakened ......if cause does not result into effect this time. choice D correctly captures this. The inherent flaw in this question is future past .i.e on the basis of a past experience we are expecting future to be same . However, all the conditions may not be same as they were in the past .

The answer must be option D. My understanding of the problem :

Conclusion : CC companies wish to maintain their growth rate by increasing the investment in campaigns

Basis for making this statement : 5 Years back only 1 in 5 had CC ; Now however, the penetration has increased.

Pre-thinking : What is it about the new strategy that will fail in achieving the objective ? I.e look for something negative.

Option A : irrelevant
Option B : How does it even matter ? Irrelevant
Option C : Talks about CC and not about the strategy
Option E : irrelevant
Option D : Correct choice ; What if the required level of market penetration has already been achieved ? The advantage of the strategy is lost !

Correct answer has to be option D.

Analysis: Credit card companies have maintained rapid growth by using telemarketing.

CONCLUSION: More telemarketing will maintain the rapid growth.

Prediction: To weaken the argument, the answer will need to show that the strategy that has worked over the last few years will not have the same growth effect over the next few years.

A) This answer is irrelevant to the argument and doesn’t weaken the conclusion.

B) This is out of scope and has no relevance to the growth of credit card companies.

C) Fails to show what could prevent further growth of credit card companies due to telemarketing.

D) Correct. You know from the premise that the last few years’ growth was due to telemarketing. Since all Korovians who belong to the target audience for telemarketing campaigns already use credit cards, telemarketing most likely will not continue to yield the same results as it did when significantly fewer Korovians were credit card owners.

E) This doesn't tell you why continuing the strategy of telemarketing will fail.

The correct answer is D

A is a pretty good contender. However, investments in telemarketing are not necessarily affected by vacancies. Thus, D is the correct answer.

quiet easy to pre-think , Answer :- D .

this pattern regularly appear in real gmat,
A is done to achieve B
to weak, most of B that ties closely with A is done already whether A is present or not.