Jim: A new company specializing in home exercise equipment is charging up to $2,500 for fancy treadmills featuring built-in entertainment systems and heart monitors. The marketing materials for these expensive machines claim that, with regular use, they can help people lose weight, eliminate stress and reduce the risk of heart disease. However, there is no indication that running on even the most advanced treadmill offers any health benefits that running on a track does not. Save your money. If you want to become more fit, go jogging outside.

Which of the following, if true, most calls into question Jim's argument?

A. Most people are more inclined to exercise on a state-of-the-art treadmill because it is more convenient and enjoyable than running outside.
B. Running on a treadmill can be less beneficial than running outside, which requires the use of a broader range of muscles to maintain pace and balance.
C. To most people who would be interested in buying a treadmill for their homes, $2,500 is not a major expense.
D. Jim was a member of a panel that conducted extensive evaluations of all of the leading treadmills currently on the market.
E. Studies show that devices that use electrical currents to simulate exertion are considerably less effective than traditional forms of exercise, such as push-ups and weightlifting, in promoting the development of muscle mass.

I have no doubts about A. Why is C incorrect?

Responding to a pm:

What is the conclusion of the argument? "Save your money by jogging outside instead of buying a treadmill."

Does C weaken it? No. It doesn't matter whether $2500 is a major expense or a minor expense. The point the author is making is that you should not spend this money since you get the same benefits from something which is free of cost. The fact that people considering buying a treadmill consider it a minor expense is no reason for them to actually buy the treadmill. You get the same benefits from something which is absolutely free. The correct option has to give you a reason why a treadmill is better than jogging outside and is hence worth some money.
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i think its B.
well it has nothing to do with costs but more of reason to do with the support a tread-mill gives in terms of heart rate monitoring, balance and less straining for muscles.