PyjamaScientist wrote:
Though I chose (A) over (D), but I am still not confident on why (D) is incorrect.
Experts may opine.
Fact1: Anyone who is planning on a career as an investment banker wants to receive an MBA degree from ILU.
Fact2: Phyllis wants an MBA from Dartmouth, which is an ILU.
Conclusion: Phyllis must be planning on a career as an Investment Banker
We are required to strengthen the argument. So, we need an answer which says that 'wants MBA from ILU' = 'plan career as Investment Banker'
(A) All of those who want an MBA from ILUs are planning careers as investment bankers.
--> This matches our analysis.(B) Some investment bankers have MBAs from ILUs
--> Phyllis can be part of some who have MBA from ILU and are not investment banker.(C) All investment bankers with MBA degrees attended ILUs
--> This statement does not prove that Phyllis is planning on a career as Investment Banker.(D) Only those planning on careers as investment bankers want MBAs from ILUs
--> This statement does not strengthen the conclusion, rather provides an alternative where it is true that only those planning on career as Investment banker want MBA from ILU; and at the same time there are those who want MBA from ILU and do not plan any career.
Think of 'career as Investment banker' and 'want MBA from ILU' as two sets. Let there be another set 'career as a Project manager. This statement says that only 'career as Investment banker' overlaps with 'want MBA from ILU' and any other set such as 'career as Project manager' does not overlap with 'want MBA from ILU'.
But ''want MBA from ILU'' can also have a section which does not overlap with 'career as Investment banker' i.e. students who do not plan any career but 'want MBA from ILU'. Phyllis can very much be part of this set.(E) Only those from ILUs are fully qualified for careers as investment bankers.
[color=#ed1c24]--> The argument only talks about planning for career as investment banker and not about qualification.[/color]
Answer: A