Critical Reasoning

Hi, guys,

I'm having a problem with this CR problem. I don't see how the answer choice, (C) weakens the argument. The correct answer is said to be (E). (This is from CR 1000)
The choice (C) mentions private services, which I thought would be out of scope. How are private services related to the argument?

Please help me with this problem. Thanks in advance!

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The postal service is badly mismanaged. Forty years ago, first-class letter delivery cost only three cents. Since then, the price has increased nearly tenfold, with an actual decrease in the speed and reliability of service.

Each of the following statements, if true, would tend to weaken the argument above EXCEPT:

(A) The volume of mail handled by the postal service has increased dramatically over the last forty years.
(B) Unprecedented increases in the cost of fuel for trucks and planes have put severe upward pressures on postal delivery costs.
(C) Private delivery services usually charge more than does the postal service for comparable delivery charges.
(D) The average delivery time for a first-class letter four decades ago was actually slightly longer than it is today.
(E) The average level of consumer prices overall has increased more than 300 percent over the last forty years.

refer to Stuart's explanation in the link
https://www.beatthegmat.com/postal-s-vices-t15754.html

Hi,

I went thru Stuart's explainations but according to him, the answer is D but official answer is E.

can someone please explain why E is official answer and why not C/D

Hi guys ..can anyone share the 1000 CRs questions/answers please..seems like a great bunch to practice.. appreciate any help.

Acc to me IMO: D as per Stuart Kovinsky explanation

D is the most suitable option in this case.