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GMAT - Critical Reasoning - Critical Reading - Weaken the argument

Which of the following pieces of information, if true, weakens the conclusion above?

Experts estimate that insurance companies' tardiness in paying doctors for legitimate medical claims adds approximately 10 percent in overhead costs for physicians. Insurance companies counter that the tardiness sometimes results from billing errors made by the doctors themselves. Since dealing with these billing errors costs the insurance companies time and money, it is clear that insurance companies do not have a significant economic incentive to delay claim payments to doctors.

Which of the following pieces of information, if true, weakens the conclusion above?

a) Some doctors who submit accurate bills to insurance companies still receive tardy payments.
b) The cost to the insurance companies to process incorrect bills from doctors' offices is roughly equivalent to the increased costs that physicians accrue as a result of tardy payments from insurance companies.
c) A rising proportion of medical claims submitted by doctors to insurance companies are deemed illegitimate by those insurance companies.
d) The billing errors made by doctors' offices are typically very minor, such as the submission of a claim with an outdated patient home address.
e) The overhead costs incurred by doctors as a result of delayed insurance payments result in an increase in the premiums paid by consumers to health insurance companies that far exceed any increase in the fees paid to doctors by insurance companies.

The conclusion of the passage is that the insurance companies' do not have an economic advantage in delaying doctors medical claims payments. As delaying the payments costs the insurance companies time and money, there is no incentive for the companies for being tardy. We need to choose an answer choice which contrasts this conclusion and shows that the insurance companies indeed have an advantage in delaying the claim payments to doctors.
a) This answer choice doesn't point to insurance companies making a profit, it just shows that the company is tardy even though the claim bills are being submitted on time.
b) This answer choice also does not tell us if the insurance companies are making any profits.
c) This answer choice is irrelevant with regards to the context of the question
d) This answer choice is also irrelevant
e) This is the correct answer choice as it clearly shows that overhead costs that the doctors incur due to delayed claims payments, far exceed the payments that the doctors ultimately get from the insurance company. This indicates that the insurance companies are making profits.